Suppose a stone is thrown upward from the edge of a cliff on Mars that is 72 ft from the ground with an initial velocity of 24 ft/s. The height s of the stone after t seconds is given by 262472.stt=++

a. Find the velocity and the acceleration of the stone at time t.

b. When does the stone reach its highest point? Answer the question with units.

c. With what velocity does the stone strike the ground? Answer the question with units.