1.

A 1 Kg ball falls from a height of 25 cm andrebounds upto a height of 9 cm. The co-efficient ofrestitution is(1) 06 (2) 0.32 (3) 0.40(4) 0-56

Answer»

U = sqrt(2gH)= sqrt(2 × 9.8 × 0.25)

v = sqrt(2gh)= sqrt(2 × 9.8 × 0.09)

e = v / u= [sqrt(2 × 9.8 × 0.09)] / [sqrt(2 × 9.8 × 0.25)]= 0.6

Coefficient of restitution is 0.6



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