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Calculate the momentum of the following :
(a) an elephant of mass 2000 kg moving at 5 m/s
(b) a bullet of mass 0.02 kg moving at 400 m/s
(a) Here mass of the elephant $m=2000\ kg$
The velocity of the elephant $v=5\ m/s$
Therefore, the momentum of the elephant $P=mv$
$=2000\ kg\times 5\ m/s$
$=10000\ kg-m/s$
therefore, momentum of the elephant is $10000\ kg-m/s$.
(b) Here , mass of the bullet $m=0.02\ kg$
Velocity of the bullet $v=400\ m/s$
therefore, the momentum of the bullet $P=mv$
$=0.02\ kg\times 400\ m/s$
$=8\ kg-m/s$
Therefore, the momentum of the bullet is $8\ kg-m/s$.
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