Question

a ball is thrown vertically upwards. Its distance d from a fixed point varies with time t according to the following graph. Calculate velocity of projection of the ball.

Answer 1

Answer:

Hey mate here is your answer....

Explanation:

Given air resistance is not ignored.Taking downward as positive y direction.

Equation of motion for upward motion,

mg−kv=ma, where kv is the air drag.

Downward motion,

mg+kv=−m

∂t

∂v

Solving the equation gives us an exponential function i.e a function which is not linear

Hence fourth graph is most appropriate.

Answer 2

Answer:

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Initially velocity is upwards and thus negative, till it decreases in magnitude to zero. After it starts falling down, it gains positive velocity in downwards direction.