Refer to the figure. The speed of the particle when its velocity becomes parallel to the inclined plane is
Step 1: Given data
From the above figure
We have to find the speed of the particle.
Step 2: Concept to be used
Velocity is defined as the distance travelled by the body in unit time in a given direction.
Step 3: Find the speed of the particle
As taking as the velocity of the particle when velocity becomes parallel to the inclined plane,
Factor out common term .
Factor of
So,
Hence, the correct option is D.