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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.

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.

Grade:12th pass

1 Answers

Arun
25750 Points
5 years ago
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

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