If an object is thrown vertically upward from a height of h0 ft with an initial speed of v...

If an object is thrown vertically upward from a height of h0 ft with an initial speed of v0 ft/sec, then its height h (in feet) after t seconds is given by

Make use of this formula in working Exercise.

An object is projected vertically upward. Suppose that its height is H ft at t1 sec and again at t2 sec. Express the initial speed in terms of t1 and t2.