△X=UxT
183=UxT
Ux=Ucos30
Ucos30T=183 (1)
Uy=Usin30
V=Uy+aT
0=Uy-9.8T
Uy-9.8T=0
Usin30-9.8T=0
T=Usin30/9.8 (2)
(2)带入(1):
Ucos30*Usin30/9.8=183
U^2 cos30sin30=1793.4
U^2=4141.7
U=64m/s
A quarterback claims that he can throw the football a horizo
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