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Grade: 12th pass
        
An engine can pull 4 coaches at a maximum speed of 20 m/s. Mass of every the engine is twice the mass of every coach. Assuming resistive forces to be proportional to the weight, 
approximate maximum speeds of the engine when it pulls 12 and 6 coaches are.
5 months ago

Answers : (1)

Arun
19778 Points
							
Dear student
 
 
A/Q 
  P=k 6mgv----------------(1)
  P=k 14mgv1----------------(2)
From eqn 1 and 2:-
 
6mgv=14mgv1
6v=14v1
V1=6×20/14
V1=8.5m/s
 
 
Also,
6mgv=8mgv2
6v=8v2
V2=6×20/8
V2=15m/s
 
Regards
Arun
5 months ago
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