Question

The kinetic energy of a body becomes four times of its initial value, then new momentum will ___________

(a) Become twice its initial value

(b) Become thrice its initial value

(c) Become four times its initial value

(d) Remains constant

The question was asked in exam.

I'm obligated to ask this question of Energy topic in chapter Kinematics of Engineering Physics I

Answer 1

The correct choice is (a) Become twice its initial value

Explanation: p = √2mK

p^‘ = √(2m×4K) = 2√2mK = 2p

If the kinetic energy of a body becomes four times of its initial value, then new momentum will become twice its initial value.