Q 9: A force of 1500N is exerted on a
body of mass 2kg for 3 sec. Find the
change in linear momentum.
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Explanation:
Answer
Force = mass × acceleration
F=10N
m=2kg
then,
a=
m
F
=
2
10
=5m/s
2
(i) Now,
u=0
t=3sec
v=u+at=0+3×5=15m/s
(ii)Initialmomentum=mu=2×0=0
Finalmomentum=mv=2×15=30kg−m/s
Change in momentum=Final momentum - Initial momentum
=30−0=30kg−m/s
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