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## Homework Statement

A ball

**A**is dropped from the top of a building of height

**h**and simultaneously a ball

**B**is thrown upwards and both balls collide. After the collision the ball

**A**has the double the velocity of ball

**B**

Determine the fraction of the building where the balls collide.

## Homework Equations

mA.V

**A**+mB.V

**B**=mA.2V'+mB.V'

V

**A**=-g.t

V

**B**=Vo-g.t

## The Attempt at a Solution

I tried with conservation of momentum, conservation of energy, but I can't get rid of the masses, they are always there and can't get them out of the equations, so I can't finish the problem.

Is there a special case when an object gets the double of the other's object velocity after a collision? I looked for it but I didn't find anything

PS: The answer is a fraction (obviously) but there are only numbers in it, so that's the reason I put it here and not in the Advanced Physics Homework.

Thanks in advance.