Question
Question: Two identical balls of equal masses A and B, are lying on a smooth surface as shown in the figure. B...
Two identical balls of equal masses A and B, are lying on a smooth surface as shown in the figure. Ball A hits the ball B (which is at rest) with a velocity v = 16 m/s. What should be the minimum value of coefficient of restitution e between A and B so that B just reaches the highest point of inclined plane. (g = 10 m/s2)
A
2/3
B
¼
C
½
D
1/3
Answer
¼
Explanation
Solution
e = (v2 –v1)/ v , mv = mv1 + mv2
1/2mv22 = mg × J
̃ v2 = 10 m/s , 16 = v1 + 10, v1 = 6m/s
e = (10–6)/16 = ¼