Answer to Question #239818 in Physics for Tina

Question

After 5 seconds, what is the initial velocity of a body thrown upward, if, above its starting place, it is to be 50 𝑓𝑡 high?

Answer 1

Find the initial velocity at which the body was thrown:

$$h=v_0t-\frac{gt^2}{2},\\\space\\ v_0=\frac{h}{t}+\frac{gt}{2}=90\text{ ft/s}.$$