Force vs Stretch 1. What is the k-value of the force vs stretch graph below? 2. If a spring below stretches 2 cm, then how much force was applied? 3. If 8 newtons of force are applied to the spring, then how far does the spring stretch? 4. If the force on a spring is 20 N and the k-value is 2 N/m, then how far would the spring stretch? 5. The spring below has a spring constant of 5 N/m. If the spring stretches 3 meters, then how much force was applied? 6. If you throw a 4 kg rock with a velocity of 23 m/s, then how much kinetic energy did you put into the rock? 7. How will gravitational energy change as the skater moves down the ramp? How does the kinetic energy change? What happens to the total energy? If the skater (50 kg) starts at the top (5 m) what is the GPE at the bottom of the ramp