Homework Help: Balls collision

1. May 10, 2005

kidia

Does anyone can help me on this please?
Ball A is dropped from the top of building at the same instant the ball B is thrown vertically upward from the ground.When the balls collide,they are moving in the same direction,and the speed of A is 4 times that of B.At what fraction of the height of the building does collision occurs?
I will appreciate.

2. May 10, 2005

Hyperreality

So, where did you get stuck? Please show us your working so we can help you.

3. May 10, 2005

Jameson

Think of ways to express the paths of both balls. Maybe a kinematic equation could help or perhaps the useful K.E. equation.... $$K.E. = \frac{1}{2}mv^2$$

That should get you started.

Jameson

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