SaraNextGen Study App [2022-23]
Last Updated On 23-10-2022 - By Sara

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 :-

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
5876 Votes
3537

Answer Key : (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 =



Next Question :

A hockey player receives a corner shot at a speed of 15 m/s at angle  with -axis and then shoots the ball along -axis with the speed 30 m/s. If the mass of the ball is 150 g and it remains in contact with the hockey stick for 0.01 s, the force exerted on the ball along -axis is

a)

281 N

b)

187.5 N

c)

562.5 N

d)

375N


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