Work Energy And Power Question 291

Question: 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 fN/kg . What extra power must the engine develop to maintain the speed up a gradient of h in s :

Options:

A) mghvs

B) mghsv

C) Mghvs

D) zero

Show Answer

Answer:

Correct Answer: A

Solution:

[a] Extra power, P=mgsinθ×v

=Mg×hs×v=Mghvs.



NCERT Chapter Video Solution

Dual Pane