If velocity of particle moving along $x-$ axis is given as $v = k\sqrt x $ . Then ($a$ is acceleration)

  • A

    $x \propto \sqrt t $

  • B

    $x \propto t$

  • C

    $a \propto x$

  • D

    $a =$ constant

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The velocity versus time graph of a body moving in a straight line is as shown in the figure below

A particle moves towards east with velocity $5\, m/s$. After $10$ seconds its direction changes towards north with same velocity. The average acceleration of the particle is

  • [IIT 1982]

Which of the following speed-time $(v-t)$ graphs is physically not possible?

Velocity of a particle is in negative direction with constant acceleration in positive direction. Then, match the following columns.

Colum $I$ Colum $II$
$(A)$ Velocity-time graph $(p)$ Slope $\rightarrow$ negative
$(B)$ Acceleration-time graph $(q)$ Slope $\rightarrow$ positive
$(C)$ Displacement-time graph $(r)$ Slope $\rightarrow$ zero
  $(s)$ $\mid$ Slope $\mid \rightarrow$ increasing
  $(t)$ $\mid$ Slope $\mid$ $\rightarrow$ decreasing
  $(u)$ |Slope| $\rightarrow$ constant

A train accelerates from rest at a constant rate $\alpha$ for distance $x_1$ and time $t_1$. After that it retards to rest at constant rate $\beta$ for distance $x_2$ and time $t_2$. Which of the following relations is correct?