![]() Calculate the force exerted on the car by the engine.Ī stone of mass 10kg falls from a height of 2.0m. Power =work donetime taken=force×distancetime=m×g×sT=1000×10×210=2000WĪn engine develops a power of 750W while moving a car at constant velocity of 3ms -s. Work done =force×distance=f×s=500N×5m=2500JĬalculate the power of a pump which lifts 1000kg of water through a vertical height of 2m in 10 seconds. Hence work done is also zero.Ī bag of rice of mass 50kg was pushed through a distance of 5m for 10seconds by a force of 500N. Since the body is not falling freely under gravity, acceleration due to gravity is zero. The SI unit of work is the joule (J), named after the 19th-century English physicist James Prescott. Calculate the work done within this period. The ancient Greek understanding of physics was limited to the statics of simple machines (the balance. ![]() Work done =force×distance=f×s=300N×20m=600JĪn object of mass 12kg is held at a height of 10m above the ground for 15 minutes. What is the work done by the body against the force of gravity?
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