Question

The kinetic energy of an object mass m moving with a velocity of 5m\s is 20 joules. What will be the kinetic energy when velocity is doubled?

Answer 1

Answer:

KE is directly proportional to the square of velocity.

So when when velocity is doubled the KE will be it's square times.

In this case v' = 5×2=10m/s

KE' = 10^2 KE

KE' = 100 × 20

KE' = 2000J = 2kJ.

Hope it helps..

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Answer 2

Answer:

Kinetic Energy= $\frac{1}{2} m {v}^{2}$

Velocity = 5 m/s

Kinetic Energy= 20 Joules

> If the velocity is doubled then the kinetic energy will be -

= $\frac {1}{2} m \: {2v}^{2}$

= m.2v (Answer)

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