A marble is placed in marble launcher what can you say about the spring potienal energy and kinetic energy of marble if it’s fired from the launcher

a) both increase

b) both decrease

c) epe decrease Ke increase

d) epe increase ke decrease

Consider an object launched vertically upward with an initial speed v. Neglect air resistance.

1. As the projectile goes upward, what energy changes take place?
   • Both kinetic and potential energy decrease.
   • Both kinetic and potential energy increase.
   • Kinetic energy decreases; potential energy increases.
   • Kinetic energy increases; potential energy decreases.
2. At the top point of the flight, what can be said about the projectile's kinetic and potential energy?
   • Both kinetic and potential energy are at their maximum values.
   • Both kinetic and potential energy are at their minimum values.
   • Kinetic energy is at a maximum; potential energy is at a minimum.
   • Kinetic energy is at a minimum; potential energy is at a maximum.

A proton is launched from point 1 in (Figure 1) with an initial velocity of 3.9×10⁵ m/s.

By how much has its kinetic energy changed, in eV, by the time it passes through point 2? Assume negative answer if kinetic energy decreases and positive if kinetic energy increases. The answer is -200eV.

A rocket is at rest on the launch pad. When the rocket is launched, its kinetic energy increases. Consider all of the forces acting on the rocket during the launch, and decide whether the following statement is true or false: The amount by which the kinetic energy of the rocket increases during the launch is equal to the work done by the force generated by the rocket's engine.