A force acts for 10 sec on a body of mass 100 kg which was at rest, after which it ceases to act. If the body travels 160 m in the next 8 sec, find the magnitude of the force.
A
100N
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B
200N
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C
300N
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D
400N
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Solution
The correct option is B200N The body travels 160 m in8 sec , the velocity acquired is v=displacementtime v=1608=20 m/s This velocity is attained in 10 sec. So, v=u+at 20=0+a(10) ⇒a=2m/s ∴F=ma =100×2 =200 N