3. A spring with a force constant of 100.0 Nlm is used to send a box sliding across a horizontal surface. The box, with a mass of 55.0 g, is pushed against the horizontal spring, compressing it 11.0 cm from equilibrium. The system is then released. (a) What is the speed of the box at the instant the spring is passing the point of being compressed 7.0 cm? (It has now moved 4 cm away from the point of maximum compression.) "J USCA ACADEMY SPH4U FINAL EXAM (b) What is the maximum speed of the box and where does it occur? (0) The box loses contact with the spring at maximum speed. If an average force of friction of 1.0 N brings the box to a stop in 2.0 s, how far will the box have travelled after leaving the spring? (T) 4. A catapult is mounted on the top of a castle wall,18 m above the ground. It launches a cow at a 55 degree angle above the horizontal. The cow lands on Sir Arthur's squire 4.56 3 later. (T) a) At what initial speed was the cow launched? b) What horizontal distance did the cow travel