Odpowiedzi

2010-03-11T19:54:16+01:00
1.

Ep = Ek
mgh = mV^:2 |*2
2mgh = mV^ |:m
2gh = V^
h = V^:2g

h = (100m/s)^:2*10m/s^ = 10000m^/s^:20m/s^ = 500m


2.

V = a*t

S = at^:2
2S = at^
t^ = 2S:a
t = √(2S:a)

t = √(2*500m:10m/s^)
t = √(1000m:10ms^)
t = √100s^
t = 10s

V = 10m/s^*10s = 100m/s