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April 19, 2014

Homework Help: Math

Posted by Lusi. on Tuesday, December 20, 2011 at 5:50pm.

A stone is thrown vertically upwards from a platform 60meters above the ground. The initial velocity of the stone is 20m/s.The height of the stone above the ground at t seconds is given by: H(t)=20t-5t^2+60m.How long does it take for the stone to hit the ground? At what velocity does the stone hit the ground?

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