Use the vertical motion model (h=-16t^2 + vt + s ) to solve the problem. A frog jumps from the ground with an initial vertical velocity of 20 feet per second. After how many seconds does it land on the ground?

Question

Use the vertical motion model (h=-16t^2 + vt + s ) to solve the problem.  A frog jumps from the ground with an initial vertical velocity of 20 feet per second. After how many seconds does it land on the ground?

anonymous · Answer

In this case, v = 20, and the frog jumps from the ground, so s = 0.
What the question is asking you is when does the height = 0?  Once you set up your equation you can either solve by factoring or using the quadratic formula.

anonymous · Answer

h= -16t^2 + 20t
t=0,5/4 seconds