the unbalanced external force applied on a body is 5 N ,then the momentum of the body changes by 10 kg m/sec. the time required to change the momentum is :
a).0.5 sec b).2 sec c).50 sec d)15 sec
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Answer:Change in momentum, Δp=F.t=0.2×10=2
Initial value of velocity =
5
10
=2m/sec
Initial energy =
2
1
×5×2×2=10J
Total final momentum =10+2=12kgm/sec
Final velocity =
5
12
m/sec
Final energy =
2
1
×5×
5
12
×
5
12
=
5
72
=14.4J
Change in energy =14.4−10=4.4joule
Explanation:
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