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The energy required to accelerate a car from rest to 10 $m s^{- 1}$ is W. The energy required to accelerate the
car from 10 $m s^{- 1}$ to 20 $m s^{- 1}$ is

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answer is C.

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Detailed Solution

$W = \frac{1}{2} \times m \times (10)^{2} = 50 m$ …(i)

and $W^{'} = \frac{1}{2} m (v_{2}^{2} - v_{1}^{2}) = \frac{1}{2} m \times (400 - 100) = 150 m = 3 W$ [from Eq. (i)]

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