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

Five balls are placed one after the other along a straight line as shown in the figure. Initially, all the balls are at rest. Then the second ball has been projected with speed  towards the third ball. Mark the correct statements. (Assume all collisions to be head-on and elastic)

a)

Total number of collisions in the process is 5

b)

Velocity of separation between the first and fifth ball after the last possible collision is

c)

Finally, three balls remain stationary

d)

All of the above


Question ID - 100222 :-

Five balls are placed one after the other along a straight line as shown in the figure. Initially, all the balls are at rest. Then the second ball has been projected with speed  towards the third ball. Mark the correct statements. (Assume all collisions to be head-on and elastic)

a)

Total number of collisions in the process is 5

b)

Velocity of separation between the first and fifth ball after the last possible collision is

c)

Finally, three balls remain stationary

d)

All of the above

1 Answer
5876 Votes
3537

Answer Key : (d) -

(d)

The situation after various collisions is as shown in fig.

After first collision, the momentum of 1 and 2 will be exchanged (property of elastic collision) and hence second ball starts to move towards 3 with velocity



Next Question :

An inverted -shaped object is placed on a smooth horizontal floor as shown in fig.

A force  is applied on the system as shown in fig. The value of  so that the system performs pure translational motion is

a)

b)

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d)


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