# Physics for a Game

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I am making a game where a 4.90 -kg ball is dropped from a height of 12.5 m above one end of a uniform bar that pivots at its center. The bar has mass 7.50 kg and is 9.00 m in length. At the other end of the bar sits another 4.40 -kg ball, unattached to the bar. The dropped ball sticks to the bar after the collision. How high will the other ball go after the collision?

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Are we to assume that the ball goes directly upwards the moment the bar is hit?

Yes.

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Are you assuming the collision is perfectly elastic, meaning no energy is lost in collisions?

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Quote:
 Original post by Satan666I am making a game where...

You know, your game sounds very familiar. I'm sure I've seen it before somewhere.

Yes.

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So adding the words "I am making a game where" and changing the thread's title makes it not your homework anymore? Or did you not quite understand jpetrie?

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It'll go about 15 and a half meters high.

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Quote:
 Original post by paulscodeIt'll go about 15 and a half meters high.

I tried using conservation of momentum and got that answer too, but amazingly that is not correct. I put it into my game, and it does not work.

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IT is close enough, the player will not notice the difference. BTW, the difference is related to torque (*hint)

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