Question

A spring of natural length \( l \) and spring constant 50 N/m is kept on a horizontal frictionless table with one end attached to a rigid support. First the spring was compressed by 10 cm and then released to hit a ball of mass 20 g kept at a distance \( l \) from the rigid support. If after hitting the ball, the natural length of the spring is restored, what is the speed with which the ball moved? (Ignore the air resistance)

• A. 5 m/s
• B. 7 m/s
• C. 25 m/s
• D. 50 m/s
• E. 2500 m/s

Hint:

On a frictionless surface, all stored spring energy converts into kinetic energy.

Answer 1

The Correct Option is A