A proton with a speed of 3.0 x 105 m/s accelerates through a potential difference and thereby increases its speed to 6.0 x 105 m/s. Through what magnitude potential difference did the proton accelerate

As a pendulum bob swings back and forth several times, the maximum height it reaches becomes less and less. this is because more and more of the pendulum bob's energy is being transformed into a. heat energy b. kinetic energy c. potential energy d. kinetic energy and potential energy