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A body of mass 40 Kg covers a distance o...

A body of mass 40 Kg covers a distance of 50 m in 5s starting from rest under the influence of a force. What is the work done by the force on the body?
a) 8000 J
b) -8000 J
c) 20000 J
d) 800 J

Text Solution

Verified by Experts

From the free bodyi diagram `4-4-muR+4gsin 30^0=0`………i
`R-4g cos 30^0=0`………ii
`rarr R=4g cos 30^0=0`

Putting the values of R in equation i. we get
`4-0.11xx4gcos 30^0+4gsin30^0=0`
`rarr 4-4a-0.11xx4xx10xxsqrt3/2+4xx10xx1/2`
`rarr 4-4a-3.81+20=0`
`rarr 4-4a-318+20=0`
`rarr a~~5m/s^2`
`:. Distance, S=ut=-1/2at^2`
`=0+(1/2)5xx2^2`
`=10 m` Hence the bock wil move 10 m
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