Question

3. A train of mass 300 tonnes moves down a slope of 1 in 200 at 45 km.p.h. with the engine developing 75 kW. Find the power required to pull the train up the slope with the same velocity. (Ans. 332.5 kW
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Answer 1

$\huge⚘ \bf \ \red{Answer}$

Power = force × velocity 

P=mgsinθ×v

$= 300 × 75 × ( \dfrac{1}{200} ) \times \dfrac{75 \times 5}{18} \\ \\ = 332.5 \: \tt{kw}$