An engine is hauling a train of mass M kg on a level track at a constant speed v m/s. The resistance due to friction is f N/kg. What extra power must the engine develop to maintain the speed up a gradient of h in s ?

An engine is hauling a train of mass M kg on a level track at a consta

1.	An engine is hauling a train of mass M kg on a level track at a constant speed v m/s. The resistance due to friction is f N/kg. What extra power must the engine develop to maintain the speed up a gradient of h in s ?
Answer» ANSWER :`(Mghv)/(s)`