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2010-01-27T13:25:03+01:00
H=50m
Vp=50m/s
Vk=0m/s
t=?
mgh=mv²/2
2gh=v²
v=√2*10*50
v=√1000
v=31.6


Vk=Vp-at
0=50-at
at=50
s=Vp*t-at²/2
50=50*t-50/t*(t)²/2
100=100t-50/t*t²
100=100t-50t
100=50t
t=2s
3 2 3