Figures (i) and (ii) below show displacement-time graphs of two particles moving along x-axis. We ca

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2.Motion in Straight Line

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Figures $(i)$ and $(ii)$ below show the displacement-time graphs of two particles moving along the x-axis. We can say that

ABoth the particles are having a uniformly accelerated motion

BBoth the particles are having a uniformly retarded motion

CParticle $(i)$ is having a uniformly accelerated motion while particle $(ii)$ is having a uniformly retarded motion

DParticle $(i)$ is having a uniformly retarded motion while particle $(ii)$ is having a uniformly accelerated motion

Solution

(c)From equation of $2nd$ law of motion for uniform acceleration, we get $x=x_{o}+\frac{1}{2} a t^{2}$ Thus when acceleration or retardation is uniform, displacement time graph will be a parabola. In fig.
$ (i)$ The particle is accelerated uniformly and in fig.
$(ii)$ the particle is decelerated uniformly.

Standard 11

Physics

A body starts from rest. What is the ratio of the distance travelled by the body during the $4^{th}$ and $3^{rd}$ second

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(AIPMT-1993)

A car is moving with velocity $V$. If stop after applying break at a distance of $20\; m$. If velocity of car is doubled, then how much distance it will cover (travel) after applying break

easy

Brakes are being applied in a car moving with speed $20\ m/s$ which produces a retardation of $5\ m/s^2$ . The distance travelled by car till it stops is……..$m$

easy

Two cars leave one after the other and travel with an acceleration of $0.4\, m/s^2$. Two minutes after the departure of the first, the distance between the cars becomes $1.9\, km$. The time interval between the departures of the cars is ……..$s$

hard

A body travels $102.5 \ m$ in ${n}^{\text {th }}$ second and $115.0 \mathrm{~m}$ in $(n+2)^{\text {th }}$ second. The acceleration is :