A spring with spring constant k=200N/m is used as a launcher for a small block w

Question

A spring with spring constant k=200N/m is used as a launcher for a small block whose mass is 100g. The block is placed against the compressed spring in a horizontal arrangement on a smooth horizontal surface. The spring, with the block, is compressed 5.00cm and then released. a. What is the speed of the block just as it leaves the spring? b. The block encounters a rough surface as it leaves the spring. If it travels a distance of 3.50m along this surface before stopping, what is the coefficient of kinetic friction between the block and the surface?

Explanation / Answer

0.5*200*0.05^2=0.5*0.1*v^2 a)v=2.23 m/s b)s=3.5 m a=mu*9.81 0=v^2-2*a*s a=v^2/2*s=0.71 mu=0.71/9.81=0.072

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