Posted by **C.** on Thursday, January 12, 2012 at 9:12pm.

A kickoff sends a football with an initial velocity of 25 m/s at an angle of 50 degrees above the horizontal.

a) find the x and y components of the velocity

b) find the time the ball is in the air

c) find the horizontal distance the ball travels before hitting the ground

d) find the maximum height of the ball

please help, I cannot seem to figure out this problem! thank you!

- Physics HELP PLEASE! -
**Damon**, Thursday, January 12, 2012 at 9:35pm
Vx = 25 cos 50

Vyi = 25 sin 50 (the little i means initial)

Time in the air is determined entirely by the vertical problem.

It starts up with initial velocity Vyi = 25 sin 50

It slows down and stops at the top due to gravity

v = Vyi - g t = 0 at top

so

t at top = Vyi/g

time in air, multiply that by two. It takes as much time to fall as to rise.

Now athe horizontal problem

There is not horizontal force so no horizontal acceleration.

Thus the speed is constant and equal to Vx = 25 cos 50

for the time in air

so

C) answer is Vx * t in air

d) how high did it go in that original t seconds? (half the time in the air)

h = Vyi t - (1/2)g t^2

- Physics HELP PLEASE! -
**C.**, Thursday, January 12, 2012 at 9:38pm
thank you so much!!!!!

- Physics HELP PLEASE! -
**My AS**, Tuesday, October 8, 2013 at 8:22pm
Thanks!!!

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