What is meant by free fall ? Two bodies, one of mass $1\,g$ and other of mass $1\, kg$ are dropped from the same height in vacuum. Compare the two time intervals in which the two bodies will hit the ground.
Whenever objects fall towards the earth under the influence of gravitational force, it is free fall. Both will hit the ground at the same time (as acceleration due to gravity is independent of mass).
If the average velocity of a body is equal to mean of its initial yelocity and final velocity, then the acceleration of the body is
Out of the three speed$-$time graphs shown below
Identify the graph for the following cases.
$(i)$ A ball thrown vertically upwards and returning to the hand of the thrower ?
$(ii)$ A body decelerating to a constant speed and accelerating.
What is the nature of the displacement$-$time graph of a body moving with constant velocity ?
A motor bike running at $90\, km h ^{-1}$ is slowed down to $18 \,km h^{-1}$ in $2.5\, s$. Calculate
$(i)$ acceleration
$(ii)$ distance covered in the time it slows down
Ravi told his friend that his house is $1 \,km$ toward south from the main Post Office. Express displacement and the distance moved by the friend from the Post Office when he arrives at Ravi's house. Mention the reference point chosen by you.