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zuggler zuggler
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11 years ago
If you ignore air resistance a projectile has a constant horizontal velocity and a constant upward acceleration. Is this true? Why or why not?


2) A ball is thrown straight up in the air at 15 m/s and then falls past the thrower down a 200M cliff. How long is the ball in the air? How high above the cliff does the ball go?
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rimazxrimazx
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11 years ago
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11 years ago
LOL!..const upward acceln=g (-ve)..Vh=const
on my home planet g=10m/s/s same radius as earth..M=2.04% bigger (physicists flock there!)
S=-200=-gt^2+15t..>t^2-3t-40=0..> (t-8)(t+5)=0  total t =8s or t=-5s (other half of S/t parabola)
max height when 15m/s is reduced by 10m/s/s=1.5sec..ave vert vel 2 top=15/2 m/s..so max height=7.5*1.5=11.25m
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