"a jack-in-the-box is a toy in which a figure in an open box is pushed down, compressing a spring. the lid of the box is then closed. when the box is opened, the figure is pushed up by the spring. the spring in the toy is compressed 0.070 meter by using a downward force of 12.0 newtons.

identify one form of energy to which the elastic potential energy of the spring is converted when the figure is pushed up by the spring."

On a horizontal frictionless surface, a small block with mass 0.200 kg has a collision with a block of mass 0.400 kg. immediately after the collision, the 0.200 kg block is moving at 12.0 m/s in the direction 30° north of east and the 0.400 kg block is moving at 11.2 m/s in the direction 53.1° south of east. use coordinates where the +x-axis is east and the +y-axis is north.(a) what is the total kinetic energy of the two blocks after the collision (in ) what is the x-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your ) what is the y-component of the total momentum of the two blocks after the collision? (indicate the direction with the sign of your answer.)