Question $9$

A $3\mathrm{.}20$ kg mass is attached to one end of a horizontal spring with spring constant $118\frac{N}{m}.$ The other end of the spring is attached to a wall and doesn't move. The spring and mass are on a horizontal, frictionless surface and the spring is initially stretched to the right by $3\mathrm{.}40$ cm relative to its equilibrium length and then the mass is released from rest and is free to start moving. What is the force and acceleration of the mass at the instant it is released?

The force is $4\mathrm{.}01$ N to the right and the acceleration is $12\mathrm{.}8\frac{m}{s^2}$ to the left.

The force is $0\mathrm{.}109$ N to the left and the acceleration is $0\mathrm{.}034\frac{m}{s^2}$ to the left.

The force is $0\mathrm{.}109$ N to the right and the acceleration is $4\mathrm{.}01\frac{m}{s^2}$ to the left.

The force is $4\mathrm{.}01$ N to the left and the acceleration is $1\mathrm{.}25\frac{m}{s^2}$ to the left.