Superman must stop a 120Km/h train in 250m to keep it from hitting a stalled car on the tracks. If the train’s mass is 4.8×100000kg, how much force must he exert? Compare to the weight of the train.
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Answer:
Vo=120,000m/h * (1/3600)h/s = 33.33m/s.
Vf^2 = Vo^2 + 2ad,
a = (Vf^2 - Vo^2) / 2d,
a = (0 - (33.33)^2) / 300,
a = - 3.7m/s.
F = ma = 3.6*10^5 * (-3.7) = -13.3*10^5 = -1.3*10^6N = Force applied
in opposite direction of train's force
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