When an object dropped on a certain earth-like planet

When an object is dropped on a certain earth-like planet, the distance it falls in t seconds, assuming that air resistance is negligible, is given by s(t)=17t2 where 50) is in feet. Suppose that a medio's reex hammer is dropped from a hovering helicopter, Find (a) how far the hammer falls in 4 sec, (b) how fast the hammer is traveling 4 sec alter being dropped, and (c) the hammers acceleration after it has been falling for 4 sec. (a) The hammer falls feet in 4 seconds. (Simplify your answer.)