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Motion in a Straight Line — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysicsMotion in a Straight Line1 Mark
MCQ
A body thrown vertically up with a velocity 'u' reaches the maximum height 'h' after 'T' second. The correct statement among the following is:
  • A
    At a height $\frac{\text{h}}{2}$ from the ground its velocity is $\frac{\text{u}}{2}.$
  • B
    At a time T its velocity is 'u'.
  • C
    At a time '2T' its velocity is -u.
  • D
    At a time 2T its velocity is -6u.
✓

Answer

  1. At a time '2T' its velocity is -u.

Explanation:

Time taken by the body to reach the maximum height is given as T and the velocity of the body at the time of throw is u (upwards).

After further time T, the body reaches to the ground having same velocity u in the downward direction as that of initial velocity at the time of throw.

Thus, at the instant 2T, the velocity of the body is −u (where minus sign represents the velocity to be in downward direction).

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