A 120 kg cart is moved on horizontal floor by a force of 124 N, to a distance of 50 m. (a) Calculate the work done on the cart, assuming there if no friction between the cart and the floor. (b) If the floor is rough (with kinetic frictional coefficient of 0.3 between floor and the cart), what is the frictional force on the cart ? (c) Now assume the 124 N force is used to move the cart to a 50 m distance on the rough surface described in part (b). What is the net amount of work done on the cart? (d) If the cart was initially at rest, what is its speed at the end of 50 m movement?

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