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Solution


Q.

A particle (bob) of mass 1 kg is performing vertical circular motion. Then:
1 Power delivered by tension at point (4) is negative.  
2 Power delivered by tension at point (2) is positive.  
3 Power delivered by gravitational force at point (3) is zero.  
4 Power delivered by gravitational force at point (4) is negative.  

Ans.

(4)

P=F→·v→,    Tension is always perpendicular to velocity