Homework Help: High School Physics

Posted by . on Thursday, October 25, 2012 at 12:02am.

The player kicks a football with an initial speed of v0 = 98 ft/s. Determine the two possible values for the angle of the kick, theta. The distance of the football field is 126 ft. Also determine the corresponding time at each of these two angles.

High School Physics - Henry, Friday, October 26, 2012 at 3:22pm
Range = Vo^2*sin2A/g = 126 Ft.
98^2*sin2A/32 = 126
98*2*sin2A = 4032
sin2A = 0.42
2A = 24.8o
A = 12.4o.

Or A = 180 - 12.4 = 167.6o.

Range = Xo * T = 126 Ft.
98*cos12.4 * T = 126
T = 1.32 s. = Time in air.

Tr = T/2 = 1.32/2 = 0.658 s.=Rise time.
= Time at 12.4o.

Tf = Tr = 0.658 s. = Fall time. = Time
at 167.6o.

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