Question

Question #59798

Answer 1

`E_2 = 0.27`[J]

Explanation:

Just before the strike

`m g h_1 = E_1 = 0.75`[J] then

`mg = 0.75/h_1 = 0.75/0.8`

After the strike the ball needs kinetic energy `E_2` to attain `0.45`[m]

so we have

`h_2 mg = E_2` or

`E_2 = 0.45xx 0.75/0.8 = 0.27`[J]