A football is kicked at ground level with a speed of 15.4 m/s at an angle of 34.7° to the horizontal. How much later does it hit the ground?

Question

(in s)

Answer 1

Vo = 15.4m/s[34.7o]
Xo = 15.4*Cos34.7 = 12.7 m/s.
Yo = 15.4*sin34.7 = 8.77 m/s.

Y = Yo + g*Tr = 0 @ max.ht.
8.77 - 9.8*Tr = 0
-9.8Tr = -8.77
Tr = 0.895 s. = Rise time.

Tf = Tr = 0.895 s. = Fall time.

Tr+Tf = 0.895 + 0.895 = 1.79 s. to hit
gnd.