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Q.

A block of mass m is projected at an angle θ with the horizontal with an initial velocity u. The average power of gravitational force over the whole time of flight is

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a

mgucos⁡θ

b

12mgucos⁡θ

c

12mgusin⁡θ

d

zero

answer is D.

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Detailed Solution

S=0  (in vertical direction) ⇒W=FS=0∴Pav=Wt=0

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