An underground train enters a station (a) the mass of the train and its passengers is 250000kg the total kinetic energy (KE) mass and velocity (i) state the relationship between kinetic energy (KE),mass and velocity
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Mass of the system (train + passengers)(m) = 250000 = 2.5 × 10⁵ kg. Kinetic energy (K.E) = 18 MJ = 180 × 10⁵ J.
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