Physics Two Dimensional Motion Question 144
Question: If $ V _{1} $ is velocity of a body projected from the point A and $ V _{2} $ is the velocity of a body projected from point B which is vertically below the highest point C. if both the bodies collide, then
Options:
A) $ {V} _{1}=\frac{1}{2}{V} _{2} $ B) $ {V} _{2}=\frac{1}{2}{V} _{1} $ C) $ ,{V} _{1}={V} _{2} $ D) Two bodies can’t collide.
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Answer:
Correct Answer: B
Solution:
[b] Two bodies will collide at the highest point if both cover the same vertical height in the same time. So, $ \frac{V _{1}^{2}{{\sin }^{2}}30{}^\circ }{2\cancel{g}}=\frac{V _{2}^{2}}{2\cancel{g}} $
$ \Rightarrow ,,\frac{V _{2}}{V _{1}}=\sin 30{}^\circ =\frac{1}{2} $
$ \
Therefore ,,,V _{2}=\frac{1}{2}V _{1} $
BETA
