Q. A particle is projected up an inclined plane with initial speed $v = 20ms^{- 1}$ at an angle $\theta = 30{^\circ}$ with plane. The component of its velocity perpendicular to plane when it strikes the plane is
A) $10\sqrt{3}\ ms^{- 1}$
B) $10\ ms^{- 1}$
C) $5\sqrt{3}\ ms^{- 1}$
D) Data is insufficient
Explanation
(b) Component of velocity perpendicular to plane remains the same (in opposite direction)
$ie,\ u\sin{\theta = 20\sin{30{^\circ}}} = 10\ ms^{- 1}$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.