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Question

A body of mass 10kg at rest is acted upon simultaneously by two forces 4 N and 3 N at right angles to each other. The kinetic energy of the body at the end of 10 sec is

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Solution

Net force on body =42+32=5N 
a=F/m=5/10=1/2m/s2
Kinetic energy = 12mv2=12m(at)2=125J

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