A particle is projected at t=0 from a point on the ground with certain velocity at an angle with the horizontal. The power of gravitation force is plotted against time. Which of the following is the best representation?
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a
b
c
d
answer is C.
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Detailed Solution
P=F→.v→=(−mgj^).[uxi^+(uy−gt)j^]=(−mguy)+mg2ti.e. P versus t graph is a straight line with negative intercept and positive slope.