A 2.0 kg block at rest on a tabletop is attached to a horizontal spring having c

Question

A 2.0 kg block at rest on a tabletop is attached to a horizontal spring having constant 19.6 N/m as in Figure P13.12. The spring is initially unstretched. A constant 20 N horizontal force is applied to the object, causing the spring to stretch.

Figure P13.12
(a) Determine the speed of the block after it has moved 1.000 m from equilibrium if the surface between the block and tabletop is frictionless.


m/s
(b) Answer part (a) if the coefficient of kinetic friction between block and tabletop is 0.200.


m/s

Figure:

http://www.flickr.com/photos/85991678@N06/7876934118/in/photostream

Explanation / Answer

a) .5*mv^2 = 20*1 - .5*19.6*1^2 = 10.2 so, v = 3.2 m/s

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