SOLVE STEP BY STEP IN DIGITAL FORMAT 27.- A mechanic pushes a 2000Kg car from rest and reaches a speed of 3m/s with a constant horizontal force. During that time the car travels a distance of 30m neglecting the friction between the car and the ground, determine; a) the work done by the mechanic and b) the horizontal force exerted on the car.

An elevator suspended by cables ascends, with constant speed, during a certain time interval. The total work done on the elevator in this time interval is: Choose an option: a) missing datab) Same as pulling work on cablesc) Nulld) Positivee) Negativef) Equal to the work of gravitational force

Several physical situations are described below. For each situation, simplify the work-energy equation by canceling any zero terms and any energy terms (whether KE or PE) which are unchanging. Explain each term which gets canceled. A cross-country skier is in motion on top of a small hill. He skis down the hill into the valley and up a second smaller hill. He uses his poles to propel himself during the entire motion. Ignore the effect of friction and air resistance. Simplification of Work-Energy Equation KEi + PEi + Wnc = KEf + PEf

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