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Q.

A body of mass 2 kg is projected at 20 m/s at an angle 60° above the horizontal Power due to the gravitational force on the block at its highest point is : (take g = l0 m/s2)

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a

200 watt

b

120 watt

c

180 watt

d

zero

answer is D.

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Detailed Solution

At highest point F→⋅v→=0 so power = 0

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