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Instantaneous Force and Impulse

A hammer of m...

Question

A hammer of mass 5 kg moving with a speed of $2 m s^{- 1}$ strikes the head of a nail driving it 20 cm into the wall. Find the impulse(in N s).

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-100

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-10

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-10000

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Solution

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

Impulse = final momentum - initial momentum

= $0$ - $(5 k g \times 2 m s^{- 1})$

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

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

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