How much momentum will a dumb-bell of mass 10 kg transfer to the floor if it falls from a height of 80 cm? Take its downward acceleration to be 10 m s -2 .

Answers (1)

For calculating momentum, we need the final velocity of the bell.

By equation of motion we can write :

v^2 = u^2 + 2as

or v^2 = 0^2 + 2	imes 10	imes 0.8

or v = 4 m/s

Thus the momentum is : p = mv

or = 10	imes 4 = 40 Kg m/s

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