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This is the bouncing ball lab. My question is when and why is the sign (-/+) different in the acceleration of gravity and the bouncing ball.

For example when the ball was in the air, it's acceleration was approx. 10 m/s2, which is very close numerically to the acceleration of gravity which is -9.8 m/s2. but why are the signs different. why is the acceleration of the ball positive if the accelereation of the force that's pulling the ball down (gravity) negative?

thank you

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# Homework Help: Simple gravity question no math involved

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