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in Physics by (58.2k points)

Determine the acceleration of a railway wagon moving on a railway track if fraction force exerted by wagon weighing 50KN is 2000N and the frictional resistance is 5N per KN of wagon’s weight.

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Let a be the acceleration of the wagon 

Mass (m) = W/g = (50 X 1000/9.81) 

Friction force Fr = 5 X 50 = 250N ...(i) 

Net force = F - Fr = ma 

2000 – 250 = (50 X 1000/9.81)a 

a = 0.3438m/sec2

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