Which of the following statements are true for a moving body?

  • A

    If its speed changes, its velocity must change and it must have some acceleration

  • B

    If its velocity changes, its speed must change and it must have some acceleration

  • C

    If its velocity changes, its speed may or may not change, and it must have some acceleration

  • D

    Both $(A)$ and $(C)$

Similar Questions

Acceleration-time graph is given. If initial velocity is $5\,\,m/s,$  then velocity after $2$ $seconds$ is.......$m/s$

A bullet from a gun is fired on a rectangular wooden block with velocity $u$.When bullet travels $24\,cm$ through the block along its length horizontally, velocity of bullet becomes $\frac{u}{3}$. Then it further penetrates into the block in the same direction before coming to rest exactly at the other end of the block. The total length of the block is $........\,cm$

  • [NEET 2023]

A motorist starting a car from rest accelerates uniformly to a speed of $v\, m/s$ in $9\, seconds$. He maintains this speed for another $50\, seconds$ and then applies the brakes and decelerates uniformly to rest. His deceleration is numberically equal to three times his previous acceleration. Then the time during which the deceleration takes place is ..........$s$ :-

If a train travelling at $72\,\, kmph$ is to be brought to rest in a distance of $200$ metres, then its retardation should be............$m{s^{ - 2}}$

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