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A pulling force, F=30.0 N stretches a spring by 3 cm (use this to find the...

A pulling force, F=30.0 N stretches a spring by 3 cm (use this to find the force constant, k). How much elastic potential energy does the spring store when it is stretched by 10 cm?

A) 50 J B) 5 J C) 20 J D) 0.5 J

An object is displaced by 50 cm on against a force of friction of 2 N. What is the work done on the object by the friction?

A) -3 J B) 300 J C) 3 J D) 30 J

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