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7. The spring is compressed by the mass (m= 2 kg) to half of its original length and then released.
The surface is not smooth and has coefficient of friction 0.2. What will be its speed after 2 s.
The spring constant is 200 N/m and the unstretched length of the spring is 60 cm.The mass is
not connected to the spring and it can slide on the surface after it is released after compression.
k
m
x = 0

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