As shown, a worker pushes a load of 500 N onto a platform with a force of 180 N by using an inclined plank. The 180N force is parallel to the inclined plank. The plank is 3 m long and the platform is 1 m above the ground. a. Find the potential energy gained by the load.

b. Find the work done by the worker.

c. Find the energy wasted during this process.

d. Hence, calculate the frictional force along the plank.

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Acave rescue team lifts an injured spelunker directly upward and out of a sinkhole by means of a motor-driven cable. the lift is performed in three stages, each requiring a vertical distance of 10.0 m: (a) the initially stationary spelunker is accelerated to a speed of 4.90 m/s; (b) he is then lifted at the constant speed of 4.90 m/s; (c) finally he is decelerated to zero speed. how much work is done on the 68.0 kg rescue by the force lifting him during each stage?

Which car has the most kinetic energy? a. a car of mass 1000 kg with a speed of 3 m/s b. a car of mass 2000 kg with speed 7 m/s c. a car of mass 1000 kg with speed 7 m/s d. a car of mass 2000 kg with speed 3 m/s