Question

kinetic energy of a moving object is 100 joules. if its speed is doubled then its kinetic energy will become how much?

Answer 1

the final answer is that kinetic energy becomes 4 times its initial kinetivc energy

Answer 2

Hey MATE!

Let the mass of body be m kg and the velocity of object be v m/s.

Therefore KE of body is :

$100 = \frac{1}{2} m {v}^{2}$
200 = mv².

If the velocity is doubled and the mass remains constant then new KE is given as :

200 = (m) (2v)²

=> 200 = 4mv²

50 = mv².

Therefore the KE of object reduces to 50 Joule if velocity is doubled.

Hope it helps

Hakuna Matata :))