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I throw a ball straight upward at an initial velocity of +40 m/s. Assuming g is...

I throw a ball straight upward at an initial velocity of +40 m/s. Assuming g is -10 m/s2, (a) how long would it take for the ball to reach its maximum height before falling back down? (b) what will its final speed be right before reaching your hand again at the same height as where you threw it? (c) how does the acceleration of the ball change as it reaches the top of its path going 0 m/s?

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