Question

Question #86795

Answer 1

The kinetic energy should become one ninth of the initial one.

Explanation:

The initial kinetic energy will be:
`K=1/2mv^2`
as the velocity becomes `v_1=1/3v` we get a new kinetic energy:
`K_1=1/2mv_1^2=1/2m(1/3v)^2=1/2m1/9v^2=1/9(1/2mv^2)=1/9K`