A rectangular block is moving along a frictionless path when it enc...

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A rectangular block is moving along a frictionless path when it encounters the circular
P loop as shown. The block passes points 1, 2,

W \( 3,4,1 \) before returning to its path on the horizontal track. At point 3 :-
- (1) its total mechanical energy is minimum
(2) the forces on it are balanced
(3) its speed is minimum
(4) it experiences a net upward force
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