Superman must stop a 100-km/h train in 110 m to keep it from hitting a stalled car on the tracks. The train's mass is 3.6 × 105 kg.?
Update:
Compare the magnitudes of the force exerted on the train and the weight of the train (give as %).
Express your answer using two significant figures.
Update 3:Determine the force that must be exerted on the train.
Express your answer to two significant figures and include the appropriate units. Enter positive value if the direction of the force is in the direction of the initial velocity and negative value if the direction of the force is in the direction opposite to the initial velocity.
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Superman must stop a 100-km/h train in 110 m to keep it from hitting a stalled car on the tracks. The train's mass is 3.6 × 105 kg.
How much force does the train exert on Superman?
F = (100/3.6)^2*1.8*10^-1/110 = 1.263 MN
Force to weight ratio = 1.263/(3.6*10^-1*9.806) = 0.358 or 35.8%
Force F' that must be exerted on the train. = -F = -1.263 MN