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Two identical balls  and are released from the position shown in fig. They collide elastically with each other on the horizontal portion.The ratio of  heights attained by and after collision is(neglect friction)

a)

1:4

b)

2:1

c)

4:13

d)

2:5



Question ID - 100235 | SaraNextGen Top Answer

Two identical balls  and are released from the position shown in fig. They collide elastically with each other on the horizontal portion.The ratio of  heights attained by and after collision is(neglect friction)

a)

1:4

b)

2:1

c)

4:13

d)

2:5

1 Answer
127 votes
Answer Key / Explanation : (c) -

(c)

When the two balls collide with each other,as the mass of the two balls is equal, they exchange their velocities on colliding elastically. Let the speed of the ball  when it reaches back to the initial position be  Then

Heightreaches by particle  (from highest point on the incline)is

total height

After collision the particle  reaches the maximum height =

Ratio =

127 votes


127