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.

Which sentences describe point source pollution? in this type of pollution, the source of the pollution is single and easily identifiable. when runoff water from the melting of snow mixes with debris, it creates pollution. the runoff water, mixed with pollutants, reaches large areas with disastrous effects. alternatively, when a wastewater treatment plant releases harmful chemicals into a stream, the chemicals pollute the stream water because they are not treated for safety.