Question

a force of 10n acts on a body of mass 5 kg for 2 seconds. If the body was initially at rest then momentum of body is after 2 seconds?

Answer 1

$\sf\small\underline\red{Given:-}$

F=10N

m=2kg

$\sf\small\underline\red{Formula:-}$

Force = mass × acceleration

$\sf\small\underline\red{Now:-}$

u=0

t=3sec

v=u+at=0+3×5=15m/s

( ii ) Initial momentum=mu=2×0=0

Final momentum=mv=2×15=30kg−m/s

Change in momentum=Final momentum - Initial momentum

$= 30 - 0$

$= 30kg - \frac{m}{s}$

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