JEE Mains · Physics · STD 11 - Newtons laws of motion
- JEE Mains 2021
- Medium
- MCQ
Two billiard balls of equal mass \(30 \,{g}\) strike a rigid wall with same speed of \(108\, {kmph}\) (as shown) but at different angles. If the balls get reflected with the same speed then the ratio of the magnitude of impulses imparted to ball \('a'\) and ball \('b'\) by the wall along \('X'\) direction is :
Pick an option to check your answer.
Answer & Solution
Correct Answer
(B) \(\sqrt{2}: 1\)
Step-by-step Solution
Detailed explanation
Ball (a) \(|\overrightarrow{\Delta p }|=2 mu = J _{1}\)
Ball (b) \(|\overrightarrow{\Delta p }|=2 mu \cos 45^{\circ}= J _{2}\)
\(\frac{J_{1}}{J_{2}}=\frac{1}{\cos 45^{\circ}}=\sqrt{2}\)
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