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"200 J of work are required to fully drive a stake into the ground. If the average resistive force on the stake by the ground is 600 N how long is

"200 J of work are required to fully drive a stake into the ground. If the average resistive force on the stake by the ground is 600 N how long is the stake?


A train starts from rest and accelerates uniformly, until it has traveled 3 km and acquired a velocity of 20 m/s The train then moves at a constant velocity of 20 for 400 s. The train then slows down uniformly at 0.065 m/s2 until it is brought to a halt. Calculate the total distance the train travels. Make a distance versus time graph and a speed versus time graph of the trains motion




A tobogganer coasts down a hill and then goes over a slight rise with speed 1.5 m/s. The top of this rise can be taken to be a circle of radius 3 m. The toboggan and occupant have a combined mass of 110 kg. If the coefficient of kinetic friction between the snow and the toboggan is 0.10, what frictional force is exerted on the toboggan by the snow as the toboggan goes over the top of the rise? Start with a free-body diagram of the toboggan with the person inside, at the top of the rise."

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