Kinetic energy.

Classical Mechanics Level 1

The kinetic energy of a moving car (at velocity 40 km/h) is 2.0 × 1 0 5 J 2.0 \times 10^5 J .

What will be the kinetic energy of the car, while it is moving at velocity 20 km/h?

3 × 1 0 6 J 3 \times 10^6 J 6 × 1 0 4 J 6 \times 10^4 J 5 × 1 0 5 J 5 \times 10^5 J 4 × 1 0 3 J 4 \times 10^3 J None of these

Munem Shahriar by Munem Shahriar , 18, Bangladesh

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1 solution

Saksham Jain
Nov 18, 2017

As we know K . E . = 1 2 m v 2 . K.E.=\frac{1}{2}mv^2 . If. v is halved then K.E becomes 1 4 \frac{1 }{4} Therefore answer is none of these

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