# post lab work and energy.doc - Post lab Work and Energy 1 A...

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Post lab: Work and Energy 1. A cart of mass 2.0 kg is released off the floor from a distance of 3.5 m. What is the change in the potential energy of the cart? Show the calculations. final pe= m*g*h = 2*9.8*3.5 = 68.6 delta pe = final - intial delta pe = 68.6 - 0 = 68.6 change in potential energy = 68.6 J 2. Later the same cart is released from rest, and it falls on the floor. What is the kinetic energy of the cart just before it hits the floor? What is its velocity before hitting? Show your calculations. Ke is same as pe which is 68.6 J Ke = ½*mv^2 = 68.6 Velocity = sqrt (2 x 68.6/2) = 8.28 Velocity before hitting = 8.28 m/s 3. Suppose, an object is released in the air. The object attains the highest point, and falls down

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