# 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 .

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

By equation of motion we can write :

$v^2\ =\ u^2\ +\ 2as$

or $v^2\ =\ 0^2\ +\ 2\times 10\times 0.8$

or $v\ =\ 4\ m/s$

Thus the momentum is : $p\ =\ mv$

or $=\ 10\times 4\ =\ 40\ Kg\ m/s$

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