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Impulsive Forces in Collision

A hammer weig...

Question

A hammer weighing of 1 kg moving with the speed of $10 m s^{- 1}$ strikes the head of a nail driving it 10 cm into a wall. Neglecting the mass of the nail.
Calculate the impulse.

-10 N s

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-100 N s

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-120 N s

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-12 N s

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Solution

The correct option is A -10 N s
Impulse = change in momentum

Impulse = final momentum - initial momentum

= $0$ - $(1 k g \times 10 m s^{- 1})$

= $- 10 k g m s^{- 1}$

= $- 10 N s^{- 1}$

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