Question

2. A ball is thrown vertically upwards. Which
of the following graphs represents the
speed (v)-time (t) graph of the ball during
its height of the air resistance is not
ignored?
VA
8​

Answer 1

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