A spring lies on a horizontal table, and the left end of the spring is attached

Question

A spring lies on a horizontal table, and the left end of the spring is attached to a wall. The other end is connected to a box. The box is pulled to the right, stretching the spring. Static friction exists between the box and the table, so when the spring is stretched only by a small amount and the box is released, the box does not move. The mass of the box is 0.82 kg, and the spring has a spring constant of 57 N/m. The coefficient of static friction between the box and the table on which it rests is ?s = 0.72. How far can the spring be stretched from its unstrained position without the box moving when it is released?

Explanation / Answer

box doesn't move,,,,means force are balanced,,,, spring force = friction force,,,,,,,,,,,,, kx = ?smg,,,,,,, 60*x= 0.69*0.65*9.8,,,,,,,,,, x=0.073255 m =7.3255 cm

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