Question

Example 57 A plastic ball is dropped from
a height of 1 m and rebounds several times from the
floor. If 1.3 s elapses from the moment it is dropped
to the second impact with the floor, what is the
coefficient of restitution ?​

Answer 1

Answer:

Velocity which with the ball strikes the floor for the 1st time

v1= undreroot 2gh =underoot 2×9.8×1= 4.472m/s

time taken by the ballbetwwen 1st and 2nd impact with the floor is

t2=1.3-t1 =1.3 - 0.452 = 0.848s

time taken by ball for upward journey

1/2 t2 =9.8×0.424 =4.155 m/s

cofficient of redtitution = v2/ v1 = 4.115/4.472

=0.939

is your answer

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