Q.

A block of mass 100kg is pulled up on an inclined plane of length 10m and 3m high by a constant force of 400N. If the work done against friction is 200J, the velocity of the block at the top of the inclined plane is (g = 10ms2 )

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a

8ms1

b

1ms1

c

4ms1

d

2ms1

answer is B.

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Detailed Solution

F.S=mgh+f.S+12mv2 

400×10=100×10×3+200+12×100×v2

V=4ms

 

               

               

 

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A block of mass 100kg is pulled up on an inclined plane of length 10m and 3m high by a constant force of 400N. If the work done against friction is 200J, the velocity of the block at the top of the inclined plane is (g = 10ms−2 )