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You're investigating a subway accident in which a train derailed while rounding an unbanked curve of radius 132 m , and you're asked to estimate whether the train exceeded the 45 km/h- speed limit for this curve. You interview a passenger who had been standing and holding onto a strap; she noticed that an unused strap was hanging at about a 15 degree angle to the vertical just before the accident. A. What do you conclude? The train didn't exceed the 45 speed limit on this curve. or The train did exceed the 45 speed limit on this curve, thus provoking the derailment.

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