science
Grade-7
Easy

Question

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

  1. Positive acceleration throughout
  2. Positive acceleration first and then negative acceleration
  3. Negative acceleration first and then positive acceleration
  4. Negative acceleration throughout

hintHint:

If the direction of the acceleration is same as the direction of velocity, then the acceleration will be positive and vice versa.

The correct answer is: Negative acceleration first and then positive acceleration


    Until 11.25 the velocity of car was decreasing which means the direction of acceleration was opposite to the direction of velocity and then after 11.25 car was speeding up which means acceleration and velocity will be in same direction. Hence the car was moving with negative acceleration first and then positive acceleration. 

    Acceleration is the rate of change of velocity.

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