A train has a 500,000 kg engine towing 20 cars on a level track. Each car has a mass of 100,000 kg. The train is speeding up at a rate of 0.1 m/sec2. The wheels of the engine do not skid. What is the minimum coefficient of static friction between the engine wheels and the track for this to happen?

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A train has a 500,000 kg engine towing 20 cars on a level track. Each car has a mass of 100,000 kg.  The train is speeding up at a rate of 0.1 m/sec2. The wheels of the engine do not skid.

What is the minimum coefficient of static friction between the engine wheels and the track for this to happen? 

a) 0.8
b) 0.05
c) 0.25
d) 0.70
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