Question

C) Acceleration is the time rate of change of velocity.

a) Give reason.

The rain drops reach on the earth’s surface falling with
uniform velocity.​

Answer 1

Answer:

The force acting on a rain drop which falling down are its weight w=mg and Air resistance R=kv2

Net force =W−R=ma

Here W=constant , a=acceleration , R= Variable

R is increasing with speed of drop and net acceleration to decrease .

When R=W(at one stage )

net force on the rain drop is zero (a=0). And after that forces.Due to air resistance increases with the speed of the rain until it balances the gravitational force.

Answer 2

Acceleration is the rate of change of velocity. Usually, acceleration means the speed is changing, but not always. When an object moves in a circular path at a constant speed, it is still accelerating, because the direction of its velocity is changing.