Question

a metal ball falls from a height 1m onto a steel plate and jumps upto a height of 0.81 m find the coefficient of restitution

Answer 1

since v = √(2as) = √(2gs) here g = 9.8 m/s^2

v for a 1m fall is √19.2 
v for a .81m bounce is √(.81 x 19.2) = 0.9√19.2 

so, the coefficient of restitution is 0.9 

i hope it will help you 
regards

Answer 2

Explanation:

I hope my answer is correct