Homework Help: Math - Trig

Posted by Amy on Wednesday, April 11, 2012 at 12:22pm.

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, Friday, April 13, 2012 at 5:05pm
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 = (Y-Yo)g = (0-50.5)/ -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.

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