help....
A stone is thrown vertically upwards from the edge of a cliff on mars (where the acceleration of gravity is 12ft/s^2) with an initial velocity of 64 ft/s from a heigh of 192 feet above ground. The height of the stone above ground after t seconds iss given by h(t)=-6t^2+64t+192
a. when does the stone reach its highest point? What is the highest point?
B. when does the stone hit the ground? What is it's velocity when it hits the ground?

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Do you know calculus?

i'm in the class now. thats the problem

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