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Physics

A car acquires a velocity of 54 ms-1 in 20 s starting from rest, then its acceleration is:

  1. 5.4 ms-2
  2. 2.7 ms-2
  3. 7.2 ms-2
  4. 2.0 ms-2

Motion in One Dimension

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Answer

2.7 ms-2

Reason — Given,

u = 0
v = 54 ms-1
t = 20 s
a = ?

Using, v = u + at or

a = vut\dfrac{v - u}{t}

a = 54020\dfrac{54 - 0}{20} = 2.7 ms-2 .

Hence, acceleration = 2.7 ms-2

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