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Q.

A juggler maintains four balls in motion.making each of them to rise a height of 20m from his hand. What time interval should be maintain, for the proper distance between them g = 10m/s2

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a

0.5 sec

b

1 sec

c

3 sec 

d

  1.5 sec 

answer is C.

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Detailed Solution

if maximum height is 20m velocity of prjection must be u=2gh= 20 m/s time of flight is 2ug= 4 sec  so time interval between the balls is 4/4 =1sec

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