Question

On a smooth carom board, a coin moving in negative y-direction with a speed of 3 m/s is being hit at the
point (4, 6) by a striker moving along negative x-axis. The line joining centres of the coin and the striker just
before the collision is parallel to x-axis. After collision the coin goes into the hole located at the origin.
Masses of the striker and the coin are equal. Considering the collision to be elastic, the initial and final
speeds of the striker in m/s will be
(1) (1,0)
(2) (2,0)
(3) (3,0)
(4) None of these​

Answer 1

Answer:

Explanation:

=> According to the question, Masses of the striker and the coin are equal and the collision to be elastic.

∴ V_y = -3 (constant)

t = 2 sec  

V_y * t = -3 * 2 = -6

and V_x * t = -4  

V_x = -4 / t

V_x = -4 / 2

V_x = -2 m/s  

So initial velocity of stricker = 2m/s

Final velocity of the striker = 0

Thus,  the initial and final  speeds of the striker in m/s will be (2, 0).