$(a)$ Define uniform circular motion.
$(b)$ Is the uniform circular motion an accelerated motion? Give reasons for your answer.
$(a)$ It is defined as the motion of a body along a circular path with constant speed.
$(b)$ Yes. This is because the direction of motion keeps on changing. This changing direction produces acceleration.
A motor car slows down from $72\, km h ^{-1}$ to $36\, km h^{-1}$ over at distance of $25\, m$. If the brakes are applied with the same force calculate $(i)$ total time in which car comes to rest $(ii)$ distance travelled by it.
Write true or false for the following statements
A body is said to be at rest, if it does not change its position with respect to the reference point.
A racing car has an acceleration of $4\, m s ^{-2} .$ What distance will it cover in $20$ seconds after start ?
What is the relation between distance and time
$(i)$ when body is moving with uniform velocity ?
$(ii)$ when body is moving with variable velocity ?
What is the slope of the displacement $-$ time graph when the body has uniform motion ?