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A body of mass 10kg at rest is acted upo...

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

A

300J

B

50J

C

100J

D

125J

Text Solution

Verified by Experts

The correct Answer is:
D
Increase in P.E=`mg(h_2-h_1)`
`=mg(2-1)=mg` Joule
At the lowest point of the swing his K.E.=`1/2mv^2`
At the high point of the swing, K.E.=0
`:.` Decrease in K.E.=`1/2mv^2`
`:.` By work energy theorem,
Decrease in K.E.=Increase in P.E.
`1/2mv^2=mg" ":." "v^2=2g=2xx10=20`
`:." "v=sqrt(20)m//s`
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