science
Grade-9
Easy

Question

A car moving at a velocity of 5 m/s accelerates to 25 m/s while covering a distance of 1.8 km. The acceleration of the car is ___ m/s2.

  1. 1 fourth
  2. 1 over 6
  3. 3 over 5
  4. 4 over 3

hintHint:

1/6 m/s²

The correct answer is: 1 over 6


    Given:
    Initial velocity (u) = 5ms-1
    Final velocity (v) = 25ms-1
    Distance (s) = 1.8Km or 1800s
    To find:
    Acceleration (a) = ?
    Solution:
    v squared space minus space u squared space equals space 2 a s space
left parenthesis 25 right parenthesis squared space minus space left parenthesis space 5 right parenthesis space squared space equals space 2 cross times a cross times 1800
625 space minus space 25 space equals space 3600 a
a space equals space 600 over 3600 space equals space fraction numerator 1 over denominator 6 space end fraction m s to the power of negative 2 end exponent
    Answer:
    Acceleration of the car is 1/6ms-2

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