A football is kicked with a speed of 18 m/s at an angle of 65° to the horizontal.
-How long is the football in the air? Neglect air resistance.
A)1.1 s
B)1.6 s
C)2.0 s
D)3.3 s
E)4.0 s

Question

Quizplus · Accepted Answer

The vertical component of the initial velocity is:$$v_{y0} = v_0 \sin 	heta = 18 \ m/s 	imes \sin 65° = 15.6 m/s$$The acceleration due to gravity is:$$g = 9.8 m/s^2$$The time of flight is:$$t = \frac{2v_{y0}}{g} = \frac{2 	imes 15.6 m/s}{9.8 m/s^2} = 3.2 s$$

A Football Is Kicked with a Speed of 18 M/s