Heather hits a tennis ball upward with an initial speed of 32 feet per second. After how many seconds does the ball hit the ground? Use the formula h = rt − 16t^2 where h represents height in feet and r represents the initial speed.

Question

across · Answer

You have all you need to solve this problem. Where are you stuck?

across · Answer

Basically, you want to find a solution to the equation$$0=32t-16t^2,$$where $t\neq0$.

anonymous · Answer

You should also note that $$h=h_0 + v_0t+\frac{1}{2}gt^2$$
where h is your height, h_0 is your initial height when you threw the ball, v_0 is your initial velocity, and g is the force of gravity (at 32ft/sec^2)
You may run into this equation again in physics and this is the equation that is used there.

across · Answer

You could also derive it from an ordinary differential equation if you feel like it...