In previous problem Q. (1) , the work done by normal reaction is Options: A . &nbsp20 joule B . &nbsp196 joule C . &nbspzero D . &nbspnone of these

In previous problem Q.

Question

In previous problem Q. (1) , the work done by normal reaction is

Options:

A . 20 joule

B . 196 joule

C . zero

D . none of these

Answer: Option C

`because ` w =` vec(F) * vec(s) = vec(N) * vec(s)`

= Ns cos `90^circ = 0`

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