By giving an example, prove that rest and motion are relative terms.
Rest and motion are opposed to each other, yet there is a close relation between them. For example, a person sitting in the compartment of a moving train is in a state of rest, with respert to the surroundings of compartment. Yet he is in a state of motion, if he compares himself with surroundings outside the compartment
An athlete completes one round of a circular track of diameter $49 \,m$ in $20 \,s$. Calculate the distance covered and displacement at the end of $30 \,s$.
Name the physical quantity which corresponds to the rate of change of momentum.
When is an object in motion considered to be a point object ?
The brakes applied to a car produce an acceleration of $6\, m s ^{-2}$ in the opposite direction of motion. If the car takes $2\, s$ to stop after the application of the brakes, calculate the distance it travels during this time.
What is the relation between distance and time
$(i)$ when body is moving with uniform velocity ?
$(ii)$ when body is moving with variable velocity ?