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A boy pulls 5 kg block by 20 m along a h...

A boy pulls 5 kg block by 20 m along a horizontal surface at constant speed with a force directed `45^(@)` above the horizontal. If the coefficient of friction is 0.2, then

A

the work done by the boy on the block 163.32J.

B

the normal force on the surface by the block is 40.8N.

C

the normal on the surface by the block is mumg`.

D

none of these

Text Solution

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The correct Answer is:
A, B
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