Boris throws a ball vertically upward from the top of the cliff. The height of the ball above the base of the cliff is approximated by the model h=-5t^2+10t+175, where h is the height in metres and t is the time in seconds.
After how many seconds does the ball hit the ground?
After how many seconds does the ball hit the ground?
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Actually this is physics, you need to set y=0 and turn it into vertex form by completing the square