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1. After how many seconds does the ball strike the ground? 7 seconds (see below): -We know that when the ball strikes the ground, the

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1. After how many seconds does the ball strike the ground? 7 seconds (see below): -We know that when the ball strikes the ground, the distance from the ground (s) is equal to 0. Therefore, we simply plug (0) into our equation for (s) and solve using the quadratic formula

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