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A block of mass 20 kg is moving on a sm...

A block of mass 20 kg is moving on a smooth surface by pulling through a light string of tension `10sqrt2` N. Find the work done by string on the block for a displacement of 2 m along the surface.

A

10J

B

`20 sqrt2`J

C

20J

D

`10sqrt2`J

Text Solution

Verified by Experts

The correct Answer is:
C
Work done by the string on the block is,
`W=(F cos 45^@) (s)`
`= 10 sqrt2 ((1)/(sqrt2))(2)`
`=20` J.
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