Question #263904

A football is kicked vertically upward from the ground and a student gazing out of a window sees it coming passed him at 16ft/sec. The window is 30ft above the ground.



a. How high does the ball go above the ground?


b. How long does it take to go from a height of 30ft to the highest point?

1
Expert's answer
2021-11-16T10:00:10-0500

v=16  ft/sh1=30  ftg=32  ft/s2v= 16 \; ft/s \\ h_1 = 30 \;ft \\ g = -32 \;ft/s^2

a.

vf2=vi2gh02=1622×32×h2h2=4  ftv_f^2 = v_i -2gh \\ 0^2 = 16^2 -2 \times 32 \times h_2 \\ h_2 = 4 \;ft

Height from the ground =h1+h2=30+4=34  ft= h_1+h_2 = 30 +4 = 34 \;ft

b.

vf=vigt0=1632tt=1632=0.5  sv_f =v_i -gt \\ 0 = 16 -32t \\ t = \frac{16}{32} = 0.5 \;s


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