A spring is stretched by an initial amount from its relaxed state. If the spring is then stretched by six times that amount from its relaxed state, by what factor does the amount of mechanical energy stored in the spring change? PE final = PE initial MY NOTES ASK YOUR TEACHER A sprinter with a mass of 68 kg reaches a speed of 8 m/s during a race. Find the sprinter's linear momentum (in kg m/s). (Enter the magnitude.) kg-m/s PRACTICE ANOTHER