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{"ops":[{"insert":"A small box (1.6 kg) is kicked down an incline with an initial speed of 6.8 m\/s. The incline makes an angle of 17.9o relative to horizontal and the force of friction has 30% of the magnitude of the normal force. What is the acceleration of the box? Use a forces approach to solve\nAn elevator is travelling 2.50 m\/s upward when the brakes are put on. The acceleration is \ud835\udc4e\u20d1 = 1.25 \ud835\udc5a \ud835\udc60 2 downward while the brakes are applied. Using kinematics: a) How many seconds does it take to bring the elevator to a stop? b) Calculate the displacement vector of the elevator while it is being brought to a stop.\u00a0\nA large object slides down a frictionless slope that is inclined at 15o . It has an initial speed of 4 m\/s. What is the speed of the object after it has slid 7 m along the slope? Solve using an energy approach.\u00a0\n"}]}
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