A child has two red wagons, with the rear one tied to the front by a stretchy rope (a spring). If the child pulls on the front wagon, the ____ increases. a. kinetic energy of the wagons b. potential energy stored in the spring c. both A and B d. not enough information

A. Potential energy at A B. Kinetic energy at A C. Kinetic energy at B D. speed at B E. Kinetic energy at C F. speed at C G. Potential energy at D H. Loss of energy between A and B  I. Loss of energy between B and C J. Loss of energy between C and D K. Total mechanical energy at B L. Total mechanical energy at D N. MIdentify all points where potential energy or kinetic energy equal to zero. (i.e. A or AB or BC or ABC or BCD or ABCD)

7. DETAILS MY NOTES A toy cannon uses a spring to project a 5.28-g soft rubber ball. The spring is originally compressed by 4.90 cm and has a force constant of 8.01 N/m. When the cannon is fired, the ball moves 15.9 cm through the horizontal barrel of the cannon, and the barrel exerts a constant friction force of 0.032 3 N on the ball. ASK YOUR TEACHER (a) With what speed does the projectile leave the barrel of the cannon? m/s (b) At what point does the ball have maximum speed? cm (from its original position) (c) What is this maximum speed? m/s

Sara used a sling shot to hunt a bird. She stretched the rubber band 5cm when she applied 2 N force. How much elastic potential energy is stored in the sling shot ? A. 0.05 J B. 0.075 J C. 0.45 J D. 0.25 J