A) 5 m/s
B) 10 m/s
C) 15 m/s
D) 20 m/s
Correct Answer: B
Solution :
[b] |
It can be observed from figure that P and Q shall collide if the initial component of velocity of P on inclined plane i.e., along incline \[{{u}_{\,\text{I}\,\text{I}}}=0\] that is particle is projected perpendicular to incline. |
Time of flight on an inclined plane of inclination \[\alpha \] is given by |
\[\text{T=}\frac{2\text{u sin}\left( \theta -\alpha \right)}{\text{g}\cos \alpha }\] |
\[\Rightarrow 4=\frac{2\text{u sin90}{}^\circ }{10\times \frac{1}{2}}\Rightarrow \text{u= 10 m/s}\]. |
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