What can you say about the motion of a body if its displacement$-$time graph is a straight line parallel to the time axis ?
The body is at rest.
Give an example of a body which covers a certain distance, but its displacement is zero
The velocity-time graph (Fig.) shows the motion of a cyclist. Find $(i)$ its acceleration $(ii)$ its velocity and $(iii)$ the distance covered by the cyclist in $15\,\sec $.
Write true or false for the following statements
Acceleration is defined as the rate of change of velocity.
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 ?
The motion in animals is called locomotion. Mechanics deals with the motion of non$-$living objects.
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