Please tell the answers of the following questions ??????

Dear student,
1) In a simple pendulum, potential energy is maximum at its highest point because at that point it does not have any kinetic energy. Similarly its kinetic energy is maximum at its lowest piont because it does not have potential energy at that time.
2) 1kWh can be defined  as the amount of electrical energy consumed when a 1000 watt electrical appliance is used for an hour. The unit of energy is watt. 1 Watt =1 Joule /second. One kilowatt hour is 3.6 megajoules. 
3) When an object moves in a circular path , the amount of work done is zero because the displacement and force are perpendicular to each other ( force is in radial direction and displacement is in tangential direction ).

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