3 years ago

A freight train has a mass of 1.5 X 10^7 kg. If the

Physics

1 answer:

Elena L [17]3 years ago

4 0

Answer:

t=444.4s

Explanation:

m=1.5*10^7 kg

F=7.5*10^5 N

v=80km/h*(1h/3600s)*(1000m/1km)=22.22m/s

Second Newton's Law:

F=ma

a=F/m=7.5*10^5/(1.5*10^7)=0.05m/s^2

Kinematics equation:

vf=vo+at=at

vo: initial velocity equal zero

t=vf/a=22.22/0.05=444.4s

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