If an object is thrown vertically upward from a height of h 0 ft with an...

If an object is thrown vertically upward from a height of h ₀ ft with an initial speed of v ₀ ft/sec, then its height h (in feet) after t seconds is given by Make use of this formula in working Exercises 70–72.

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.