The speed$-$time graph of a body is a straiaht line parallel to time axis. The body has

  • A

    uniform acceleration

  • B

    uniform speed

  • C

    variable speed

  • D

    variable acceleration

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What type of motion is represented by the following graphs ?

There are 5 houses on a street, $A, B, C, D$ and $E$. For all cases, assume that positions to the right are positive.

$(i)$ Draw a frame of reference with house $A$ as the origin and the positions of houses $B, C, D$ and $E$.

$(ii)$ You live in house $C.$ What is your position relative to house $E$ ?

$(iii)$ What are the positions of houses $A$ and $D$, if house $B$ is taken as the reference point ?

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 ?

Out of the three speed$-$time graphs shown below

Identify the graph for the following cases.

$(i)$ A ball thrown vertically upwards and returning to the hand of the thrower ?

$(ii)$ A body decelerating to a constant speed and accelerating.

What do uou understand by the term acceleration ? When is it positive and when is it negative ?