A block of mass 1.9 kg is attached to a horizontal spring that has a force const

Question

A block of mass 1.9 kg is attached to a horizontal spring that has a force constant 900 N/m as shown in the figure below. The spring is compressed 2.0 cm and is then released from rest.
(a) A constant friction force of 3.7 N retards the block's motion from the moment it is released. Using an energy approach, find the position x of the block at which its speed is a maximum.
(b) Explore the effect of an increased friction force of 11.0 N. At what position of the block does its maximum speed occur in this situation?

Explanation / Answer

.5*k*.02^2=3.7*x a)so x=.05 m b).5*k*.02^2=11*x x=.016 max speed just after compressing

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