The drawing shows three situations in which a block is attached to a spring. the position labeled "0 m" represents the unstrained position of the spring. the block is moved from an initial position x0 to a final position xf, the magnitude of the displacement being denoted by the symbol s. suppose the spring has a spring constant of k = 43.8 n/m. using the data provided in the drawing, determine the total work done by the restoring force of the spring for each situation. in the case of zero put your result as "+0".

Visualize the problem and identify special cases first examine the problem by drawing a picture and visualizing the motion. apply newton's 2nd law, ∑f⃗ =ma⃗ , to each body in your mind. don't worry about which quantities are given. think about the forces on each body: how are these consistent with the direction of the acceleration for that body? can you think of any special cases that you can solve quickly now and use to test your understanding later? one special case in this problem is if m2=0, in which case block 1 would simply fall freely under the acceleration of gravity: a⃗ 1=−gj^.