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Question

Find work done by normal reaction on B during the given displacement.

4000 J
3000 J
1000 J
2000 J

A

1000 J

B

2000 J

C

3000 J

D

4000 J

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Solution

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$(W_{N})_{o n B} = 40 \times 100 \times c o s 0^{\circ}$
= 4000 J

$(W_{N})_{o n A} = 40 \times 100 \times c o s 180^{\circ}$ = - 4000 J

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