Question

If the mass of a moving body is decreased by one -
third of its initial mass and velocity is tripled, the
percentage change in its kinetic energy is
(A) 500%
(B) 600%
(C) 300%
(D) 200%​

Answer 1

Answer:

200%

Explanation:

suppose initial K.E=1/2mv²=k

A/Q,final K.E=1/2*m/3*9v²=1/2*3mv²=3k

Now,Change in K.E=Final-Initial

=3k-k=2k

So,%change=change K.E/Initial K.E*100

= 2k/k *100

=200%

Answer 2

Answer:

answer is 1st option 500 percentage only

with confident