Question

In : 3.28 tt v²-1² +2 lg-yo) 21.3m 15. A football is kicked at an angle of 35° with an initial speed of vo = 70 ft/s toward a goal post crossbar that is 125 feet away and 10 feet high. The gravity g is 32.2 it's 38.1 3.4 9. 8m Vo = 70 ft/s goal post crossbar 10 ft 125 feet a) How many seconds will it take the ball to reach the goal post crossbar? (5 pts.) 20 S9.5 time of flight 21.3m - I see 38.1m = ? 55 x 38.1 - 1.8 sec. 2185 b) Will the ball clear the crossbar? If yes, by how much above the crossbar? If no, by how much below the crossbar? NO 10 Leet (5 pts.) clears by 1,014 ft

Answer 1

a)

motion along horizontal

d = v cos x * t

125 = 70 cos 35 * t

t = 2.18 s

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b)

motion along vertical

h = v sin x * t - 0.5 gt^2

h = 70 sin 35*2.18 - 0.5 * 32.2* 2.18^2

h = 11.015 m

yes, it will cross the bar by

y = 11.015 - 10 = 1.015 m

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