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7.A radio-controlled car increases its kinetic energy from 2 J to 10 J over a distance...

7.A radio-controlled car increases its kinetic energy from 2 J to 10 J over a distance of 5 m. What was the average net force on the car during this interval?

_____N

8.A toy car has a kinetic energy of 4 J. What is its kinetic energy after a frictional force of 0.5 N has acted on it for 6 m?

______J

9.How much work does a 68 kg person do against gravity in walking up a trail that gains 760 m in elevation?

______kJ

10.A woman with a mass of 45 kg climbs a set of stairs that are h = 3 m high. How much gravitational potential energy does she gain?

______J

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