Question

By what factor does the kinetic energy of a moving body change when its velocity is reduced to one third of the intial velocity

Answer 1

Answer:

1/9

Explanation:

We know that,

k1=1/2mv²

According to questions,

v--> 1/3v

So,

k2=1/2m(1/3v)²

=1/2m(1/9v²)

=1/18 mv²

=1/9(1/2mv²)

=1/9(k1)