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A stone of weight W is thrown straight up from the ground with an intial speed u. If a drag force of constant magnitude f acts - on the same through out its flight , the speed of stone just before reaching the ground is (1) usqrt((W-f)/W) (2) usqrt((W+f)/f) (3) u sqrt((W+f)/(W-f)) (4) u sqrt((W-f)/(W+f))

Why is short run marginal cost curve 'U'-shaped?

A short linear object of length b lies on the axis of a concave mirror of focal length F at a distance u from the pole. The length of the image will be

The initial velocity of a particle is u (at t = 0) and the acceleration f is given by f = at. Which of the following relation is valid?