Q.

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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a

100 J

b

300 J

c

50 J

d

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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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