# a rain of mass 4000 metric tons is moving with a velocity of 18KMPH. with the application of a force, its velocities changes to 'v' in 2 mins. if the power of the engine is 10MW, the value of 'v' is? (ans : 90)

Dear Student,

Given information

mass of the train ; initial velocity of the train  ; power of the engine is  and The time period is . Let the final velocity of the train is ${V}_{f}$. Therefore, according to the conservation of energy,