Work Energy And Power Question 85
Question: A heavy steel ball of mass greater than 1 kg moving with a speed of 2 $ m{{\sec }^{-1}} $ collides head on with a stationary ping-pong ball of mass less than 0.1 gm. The collision is elastic. After the collision the ping-pong ball moves approximately with speed [EAMCET 1982]
Options:
A) $ 2m{{\sec }^{-1}} $
B) $ 4m{{\sec }^{-1}} $
C) $ 2\times 10^{4}m{{\sec }^{-1}} $
D) $ 2\times 10^{3}m{{\sec }^{-1}} $
Show Answer
Answer:
Correct Answer: B
Solution:
We know that when heavier body strikes elastically with a lighter body then after collision lighter body will move with double velocity that of heavier body. i.e.the ping pong ball move with speed of $ 2\times 2=4\ m/s $
