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g=10m/s2
m=F/g
m=25/10=2,5kg
3. Ek=100J
m=2kg
V=?
Ek=mV²/2
2Ek=mV²
V²=2Ek/m
V=√2Ek/m
V=√2*100/2=10m/s
4.W=230J
F=46N
W=Fr
r=W/F
r=230/46=5m
5.m=1t=1000kg
V=54-36=18Km/h=5m/s
t=2s
a=V/t
a=5/2=2,5m/s2
Ek=mV²/2
Ek=1000*5²/2=12500J
p=mV
p=1000*54=54000kg*m/s
6.s=20m
g=10m/s²
t=?
s=gt²/2
2s=gt²
2s/g=t²
t=√2s/g
t=√2*20/10=2s
1.a)t=1min=60s
v=72km/h=20m/s
a=V/t
a=20/60=1/3 m/s2
a=0
b)s=at²/2
s=1/3 * 60²/2=600m
s=Vt
s=20*60=1200m
c) Vśr=0+20/2=10m/s
Vśr=20m/s