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

# 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

1. A

2 : 3

2. B

2 : 1

3. C

1 : 2

4. D

1 : 1

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### Solution:

Use ${\mathrm{v}}^{2}-{\mathrm{u}}^{2}=2\mathrm{aS}.$  In both the cases, (u positive or negative) ${\mathrm{u}}^{2}$ is positive

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