3. (5pts) A spring-loaded toy gun is used to launch a 10 g plastic ball. The spring, which has a spring constant of 10 N/m, is compressed by 10 cm as the ball is pushed into the barrel. When the trigger is pulled, the spring is released and shoots the ball back out hori- zontally. What is the ball's speed as it leaves the barrel? Assume that friction is negligible. Before: wwwww.D V = 0 m/s x x = -10 cm x=0 After: M Vf xf=0 cm Find: Vf 4. (5pts) If the same toy gun was shot vertically upward. How high would the ball go? Use energy concepts to solve.