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29 March, 17:12

1) A ball is thrown upwards from a rooftop, 80m above the ground. It will reach a maximum vertical height and then fall back to the ground. The height of the ball from the ground at time t is h, which is given by, h = - 16t2 + 64t + 80

a. How long will it take before hitting the ground?

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  1. 29 March, 19:06
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    gfhhraegdgnght
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