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2009-11-03T12:07:02+01:00
54km/h=15m/s
36km/s=10m/s
a=delta v/t
a=5m/s/60s
a=1/12m/s2
m=F/a
m=30N/1/12m/s2
m=360kg
2009-11-03T12:07:52+01:00
F=30 N
v1=54 km/h = 15 m/s
v2=36 km/h = 10 m/s
Δt = 1min = 60 s

F=m*a
a=Δv/Δt

F=m*Δv/Δt

m=F*Δt/Δv
m=30*60/(15-10)=1800/5= 360 kg

[N*s/m/s=N*s²/m=kg*m*s²/m*s²=kg]