Question

# Match the following and choose the option with all the right matches:

i |
Positive acceleration |
a |
Slowing down |

ii |
Negative acceleration |
b |
Uniform motion |

iii |
Zero acceleration |
c |
The motion of a running athlete |

iv |
Non-uniform acceleration |
d |
Speeding up |

- i—d, ii —a, iii —b, iv —c
- i—c, ii —a, iii —b, iv —d
- i—d, ii —b, iii —a, iv —c
- i—b, ii —d, iii —a, iv —c

Hint:

### Acceleration = change in velocity / time taken.

## The correct answer is: i—d, ii —a, iii —b, iv —c

- An object is said to be in positive acceleration when its speed is increasing continuously.
- while an object will be in negative acceleration when its speed is reducing or in the opposite direction.
- In uniform motion there is no change in velocity hence the acceleration is also zero.
- The motion of a running athlete is a non-uniform motion as he may not covers equal distance in equal interval of time.

Acceleration is a vector quantity

### Related Questions to study

### A train starts from rest and picks up a velocity of 15 m/s in 3 s. The acceleration of the train is ___ m/s^{2}.

### A train starts from rest and picks up a velocity of 15 m/s in 3 s. The acceleration of the train is ___ m/s^{2}.

### Which of the following constantly changes during a uniform circular motion?

When an object completes one round then the displacement will be zero.

### Which of the following constantly changes during a uniform circular motion?

When an object completes one round then the displacement will be zero.

### Sam wants to modify the formula for acceleration

I.e., a = (v – u)/ t

Where v = final velocity, u = initial velocity, t= time, a = acceleration, to suit the special case of freefall of a ball dropped from the top of a building. He chooses to make the following substitutions in the formula.

a. v= 0

b. u= 0

c. a= 9.8 m/s^{2}

Identify the correct substitutions.

Acceleration of gravity is 9.8ms^{-2}

### Sam wants to modify the formula for acceleration

I.e., a = (v – u)/ t

Where v = final velocity, u = initial velocity, t= time, a = acceleration, to suit the special case of freefall of a ball dropped from the top of a building. He chooses to make the following substitutions in the formula.

a. v= 0

b. u= 0

c. a= 9.8 m/s^{2}

Identify the correct substitutions.

Acceleration of gravity is 9.8ms^{-2}

### A monkey falls from the top of a tall tree reaches a velocity of ___ m/s in 20 s.

### A monkey falls from the top of a tall tree reaches a velocity of ___ m/s in 20 s.

### A body moves in such a way that its velocity increases by 4 m/s every second. Its acceleration is ___ m/s^{2}.

### A body moves in such a way that its velocity increases by 4 m/s every second. Its acceleration is ___ m/s^{2}.

### What is the acceleration of a truck which starts from rest, and after 5 s its velocity is 20 m/s? What is the direction of the acceleration of the truck?

### What is the acceleration of a truck which starts from rest, and after 5 s its velocity is 20 m/s? What is the direction of the acceleration of the truck?

### Acceleration is a _____ quantity, as it has ____.

In positive acceleration its magnitude will be positive and direction is same as of the velocity.

In negative acceleration its magnitude will be negative and direction is opposite as of the velocity.

### Acceleration is a _____ quantity, as it has ____.

In positive acceleration its magnitude will be positive and direction is same as of the velocity.

In negative acceleration its magnitude will be negative and direction is opposite as of the velocity.

### A car moves at a speed of 5 m/s throughout its journey. What is its acceleration?

the car is not speeding up or slowing down.

### A car moves at a speed of 5 m/s throughout its journey. What is its acceleration?

the car is not speeding up or slowing down.

### A car moving at a velocity of 6.5 m/s increases its velocity uniformly to 78 m/s in 10 s. Work out its acceleration with a proper sign.

Positive acceleration means the direction of acceleration is same as of the direction of velocity.

### A car moving at a velocity of 6.5 m/s increases its velocity uniformly to 78 m/s in 10 s. Work out its acceleration with a proper sign.

Positive acceleration means the direction of acceleration is same as of the direction of velocity.

### Pick the odd one out.

### Pick the odd one out.

### The following table shows the velocity of a moving car at different timestamps. The car is undergoing ___.

Timestamp |
Velocity in m/s |

11:00 |
34 |

11:05 |
32 |

11:10 |
27 |

11:15 |
18 |

11:20 |
24 |

11:25 |
43 |

11:30 |
49 |

Acceleration is the rate of change of velocity.

### The following table shows the velocity of a moving car at different timestamps. The car is undergoing ___.

Timestamp |
Velocity in m/s |

11:00 |
34 |

11:05 |
32 |

11:10 |
27 |

11:15 |
18 |

11:20 |
24 |

11:25 |
43 |

11:30 |
49 |

Acceleration is the rate of change of velocity.