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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100 J

300 J

50 J

125 J

answer is D.

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Detailed Solution

Net force on body =42+32=5N ∴a=F/m=5/10=1/2 m/s2Kinetic energy = 12mv2=12m(at)2=125 J

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