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You stand on a roof and fire a spring-loaded BB gun horizontally. The BB is fired...

You stand on a roof and fire a spring-loaded BB gun horizontally. The BB is fired from a height of 4 m above the ground. The BB has a mass of 3 grams and lands on the ground a distance of 30 m from where it was fired. The spring in the gun is compressed 12 cm before firing.

a) What is spring constant k of the spring?

b) How many newtons of force is required to compress the spring 12 cm?

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