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Q.

A body of mass 5kg at rest is acted upon by two mutually perpendicular forces 6N and 8N simultaneously. Its kinetic energy after 10s is,

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a

200 J

b

500 J

c

1000 J

d

100 J

answer is D.

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Detailed Solution

F=F12+F22=10N

a=Fm=105=2ms2

V10=U+at

=0+2×10=20ms1

K10=12mv102

=12×5×400=1000J

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