Question

A classmate describes a trick he saw using newtons cradle‘s he pulled back two of the cradle balls and let them swing down to strike the line of the other balls. he then saw three ball swing away on the other side with the same speed as the first two balls the three balls only rows to 2/3 of the original height. explain what must be wrong with your classmates description. A. Only two ball should swing away. B. The three ball should have less speed than the first two. C. The three balls should have reached the original height. D. Only one ball should have reached 2/3 of the original height.

Answer 1

Given that the classmate pulled two cradle balls but when he swings them down, three balls swing other away.

All the balls have same mass, Newton's cradle ball is an example of conservation of momentum and enegy.

The two balls when pulled away

So, when two balls are pulled and swinged down, only two balls will swing the other side.

Thus, option A is correct.