Posted by Amy on .
A projectile is fired with an initial velocity of 88 ft/sec at an angle of 35° to the horizontal. Neglecting air resistance, what is the time of impact? I just can't figure it out.

Math  Trig 
Henry,
I am assuming the time of impact is the time to strike ground.
Given: Vo = 88Ft/s @ 35 Deg. = Initial velocity.
Xo = 88*cos35 = 72.1 Ft/s = Hor. comp.
Yo = 88*sin35 = 50.5 Ft/s = Ver. comp.
Tr = (YYo)g = (050.5)/ 32 = 1.58 s =
Rise time.
Tf = Tr = 1.58 s. = Fall time.
Tr + Tf = 1.58 + 1.58 = 3.16 s. = Time
in flight or time of impact.