Question

Figure shows a light, inextensible string attached to a cart that can slide along a frictionless horizontal rail aligned along an `x` axis. The left end of the string is pulled over a pulley, of negligible mass and friction and fixed at height `h = 3m` from the ground level. The cart slides from`x_(1) = 3 sqrt(3) m` to `x _(2) = 4 m` and during to move, tension in the string is kept constant `50 N`. Find change in kinetic energy of the cart in joules. `(Use sqrt(3) = 1.7)` in form of `10 x n`, where `n=`
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Answer 1

Correct Answer - `5`
Change in kinetic energy = Work done by the force ,
so `W = 50 xx 1` (along the string) ,
so `W = 50 "Joule"`.