A moving body is covering a distance directly proportional to the square of time. The acceleration of the body is
increasing
decreasing
zero
constant
Give an example of a body which covers a certain distance, but its displacement is zero
Name a physical quantity that essentially changes as a body moves.
A driver of a train travelling at $40\, m s ^{-1}$ applies the breaks as a train enters a station. The train slows down at a rate of $2\, m s ^{-2} .$ The platform is $400\, m$ long. Will the train stop in time ?
An electron moving with a velocity of $5 \times 10^{4}\, ms ^{-1}$ enters into a uniform electric field and acquires a uniform acceleration of $10^{4}\, ms ^{-2}$ in the direction of its initial motion.
$(i)$ Calculate the time in which the electron would acquire a velocity double of its initial velocity.
$(ii)$ How much distance the electron would cover in this time ?
Derive the equation $v^{2}-u^{2}=2 a S$ graphically.