a metal ball falls from a. height 1m onto a. steel. plate and jump. up. to a. height of. 0.81m. .find. the. coefficient of restitution

Answer 1

since v = √(2as)
v for a 1m fall is √19.2
v for a .81m bounce is √(.81*19.2) = .9√19.2

so, the c.r is 0.9

it's just the √ of the bounce-height ratio.