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Physics Problem of the Week for Dec 08 2014

Truck and Boulder

A truck is moving at 21 m/s. The driver sees a boulder in the road, directly ahead 110 m away. After a reaction time (during which the truck continues at 21 m/s), the driver applies the brakes, which decelerates the truck at 3 m/s$^2$. What is the maximum allowable reaction time to avoid a collision?

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