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Question

A force acts for 10 sec on a body of mass 100 kg after which it ceases. If the body travels 160 m in the next 8 sec, find the magnitude of the force.

A
100 N
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B
200 N
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C
300 N
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D
400 N
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Solution

The correct option is B 200 N
Let AB be the distance travelled by body when the force was acting and BC be the distance travelled in absence of force.
For BC:
Using second equation of motion
SBC=vBt+12at2
160=vB×8 ( acceleration =0)
vB=20 m/s
For AB:
vB=u+at
20=0+a×10
a=2 m/s2
F=ma=100×2=200 N

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