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The height of the ball in meters that is thrown up has been modeled by the equation h(t) = - 5t 2 + 40t, with

The height of the ball in meters that is thrown up has been modeled by the equation h(t) = - 5t2 + 40t, with t representating time in seconds.

a) determine the velocity of the ball over the first 3 seconds.

b) determine the velocity of the ball when it hits the ground again?

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