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A gardener pushes a lawn roller through ...

 A gardener pushes a lawn roller through a distance 20 m. If he applies a force of 20 kg-wt in a direction inclined at `60^@` to the ground, the work done by him is 

A

1960 J

B

196J

C

1.96J

D

196 kJ

Text Solution

Verified by Experts

The correct Answer is:
A
The work done by gardener is `W = F s cos theta`
Here, `F = 20 kg wt = 20 xx 9.8 N = 196 N , s = 20 m , theta = 60^@`
`:. W = 196 xx 20 xx cos 60^@ = 1960 J`
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