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g=10m/s2
dit: berapa lama waktu bola di udara?
Jawab:
Rumus ymaks:
80=\frac{ V_{0}^{2}.sin^{2} \alpha }{20}\\ \\1600=V_{0}^{2}.sin^{2} \alpha \\40= V_{0}.sin \alpha
Rumus t di udara:\frac{2.V_{0}.sin \alpha }{g}
t=\frac{2.V_{0}.sin \alpha }{g}\\ t=\frac{2.40}{10}=8s
jadi lama bola di udara selama 8 sekon
...
cari lama bola diudara dengan :
t = 8 s