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3.2 , motion in plane — Physics STD 11 Science — Question

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics3.2 , motion in plane1 Mark
MCQ
$A$ body $A$ is thrown vertically upwards with such a velocity that it reaches a maximum height of $h$. Simultaneously another body $B$ is dropped from height $h$. It strikes the ground and does not rebound. The velocity of $A$ relative to $B v/s$ time graph is best represented by : (upward direction is positive)
  • A

  • B

  • ✓

  • D

✓

Answer

Correct option: C.

c
For first half,

$V_{a}=u-g t$

$V_{b}=-g t$

$V_{a b}=u-g t-(-g t)$

$=u \quad \Rightarrow \text { constant }$

For Second half.

$V_{a}=-g t$

$V_{b}=0$

$V_{a b}=-g t \Rightarrow-v e$ slope

$\Rightarrow$ Option $\mathrm{C}$

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