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Q.

A particle (mass m) is projected with an initial velocity v at an angle θ to the horizontal. What is the work done by the force of gravity from the instant of throwing to the instant it reaches the highest point?

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a

zero

b

mv2sinθ

c

-mv2sinθ

d

-mv2sin2θ2

answer is D.

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Detailed Solution

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Wmg = Kf-Ki = 12m(v cos θ)2-12mv2

           = 12mv2[cos2θ-1]  = -12mv2 sin2θ

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