Question

As shown in the figure, a rod is placed on a horizontal surface with one end hinged and a ball moving with speed 5 m/s strikes it perpendicularly at the other end. If after the collision, rod starts rotating with angular speed 2 rad/s and the ball returns along the same path with 1.5 m/s, then coefficient of restitution for the collision is

• A. 0.25
• B. 0.4
• C. 0.5
• D. 1

Answer 1

Answer: (C)

0.5

Answer 2

Velocity of separation

Lω + 1.5 m/s = 2.5 m/s

$e = \frac{2.5}{5} = 0.5$

Velocity of approach and separation are calculated by using velocities of the points of collision on the objects.