A railway engine accelerate a train of total mass 800 turns from rest to a speed of 50 how much useful work must be done on the train to reach this is speed

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

connect the batteries in series and hope