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Q.

A ball is thrown vertically upwards with a speed of 10 m/s and another ball is thrown vertically downwards with the same speed simultaneously from the top of a tower. The time difference between them in reaching the ground (in s) is:  g=10m/s2

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a

2

b

1

c

12

d

6

answer is C.

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Detailed Solution

For both of them displacements are same.

 h=-ut1+12gt12  and h=ut2+12gt22 solving we get u=12gt1-t2

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