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STD 11 - 2. motion in straight line — JEE STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceJEESTD 11 - 2. motion in straight line4 Marks
MCQ
Ball $A$ is thrown up vertically with speed $10 \,m / s$. At the same instant another ball $B$ is released from rest at height h. At time $t$, the speed of $A$ relative to $B$ is ...........
  • ✓
    $10 \,m / s$
  • B
    $10-2 g t$
  • C
    $\sqrt{10^2-2 g h}$
  • D
    $10-g t$
✓

Answer

Correct option: A.
$10 \,m / s$
a
(a)

$v_A=10 \,ms ^{-1}-10 t$

$v_B=0-10 t$

$v_{A B}=v_A-v_B=10-(10 t)-(-10 t)=10-10 t+10 t=0$

$\Rightarrow v_{A B}=10 \,ms ^{-1}$

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