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- Thread starter BunHead
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- #1

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- #2

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Air resistance of 25? 25 what?

- #3

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25N ... Thnx

- #4

SGT

When the ball goes down, there will be a force of (5*9.8 - 25) N accelerating it. Knowing the height the ball starts on, you can calculate the time to reach ground.

edited to add:

The work done by air resistance is the force times the diplacement. Or 25N times twice the height.

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Just for fun....how would we calculate the Kinectic energy back to the original place?

- #6

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Keep in mind though air resistance isnt constant, so saying 25N from air resistance doesnt really make sense.

- #7

SGT

Loozer said:Just for fun....how would we calculate the Kinectic energy back to the original place?

Once you know the height the ball has attained and the accelerating force down (5*9.8+25)N, you can calculate the final velocity V. The kinectic energy is 5*V

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