Question

SP-WB(1)-PH-25
9.
m
A body of mass m has a kinetic energy equal to one-fourth kinetic energy of another body of mass
1. If the speed of the heavier body is increased by 4 m/s, its new kinetic energy equals the original
kinetic energy of the lighter body. The original speed of the heavier body in m/s is
(A) 8
(B) 6
(C) 4
(D) 2​

Answer 1

Answer:

(A) 8

Explanation:

when then kinetic energy increases the mass decreases and vice versa.