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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 | Top Ranker Answer | SaraNextGen

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



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