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Q.

Two stones are thrown from the top of a tower, one straight down with an initial speed u and the second straight up with the same speed u. When the two stones hit the ground, they will have speeds in the ratio 

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a

1 : 2 

b

1 : 1 

c

2 : 3 

d

2 : 1 

answer is D.

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Detailed Solution

Use v2−u2=2aS.  In both the cases, (u positive or negative) u2 is positive

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