An 81 g arrow is fired from a bow whose string exerts an, Ask an Expert

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An 81 g arrow is fired from a bow whose string exerts an average force of 95 N on the arrow over a distance of 75 cm. What is the speed of the arrow as it leaves the bow?

At an accident scene on a level road, investigators measure a car's skid mark to be 68 m long. It was a rainy day and the coefficient of friction was estimated to be 0.38. Use these data to determine the speed of the car when the driver slammed on (and locked) the brakes

A spring has a spring constant, k, of 435 N/m. How much must this spring be stretched to store 21 J of potential energy?

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