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Question

A car with an initial velocity of 30km/h begins to accelerate constantly and attains a speed of 60km/h in 5seconds. What is the acceleration of the car?
  1. 53ms

  2. 153ms2

  3. 56ms2

  4. 53ms2


Solution

The correct option is D

53ms2


Given:
Initial velocity:
     u=30km/h
or, u=30×1000m3600s
or, u=253ms1

Final velocity:
v=60km/h
v=60×1000m3600s
v=503ms1

Time taken, t=5s

Acceleration is defined as the ratio of change of velocity to the time taken.
Hence, acceleration is given by:
     a=vut
or, a=5032535
or, a=53ms2

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