Answer the following questions
$(i)$ State the type of motion shown by a freely falling stone.
$(ii)$ When a stone is thrown vertically upwards its velocity is continuously decreased. Why ?
$(iii)$ Give an example of a motion in which average velocity is zero, but the average speed is not zero.
A train $100 \,m$ long is moving with a velocity of $60\, km h^{-1}$. Find the time it takes to cross the bridge $1\, km$ long.
If the displacement of an object is proportional to square of time, then the object moves with
When is an object in motion considered to be a point object ?
Two graphs for motion of objects moving along a straight line are shown. State how the speed is changing with time in both cases.