Question

Determine the average velocity (in m/s) of the object for the first 7 seconds of motion. (If negative, then enter a negative answer.)

Answer 1

A football is kicked at ground level with a speed of 25.0 m/s at an angle of 31.0° to the horizontal. How much later does it hit the ground?

Answer 2

use 0 = 25*sin(31) *t -1/2*g*t^2
to solve for t

Answer 3

that would give me -2.06...is that correct? how would time be able to be that?