1. A marble launcher fires a marble at an angle of 50° to the horizontal with an initial velocity of 6.2 m/s. Assuming no air friction, what is the maximum height above the
launcher's muzzle that the marble reaches?

answer would be letter choice (a),   a ball resting on a shelf. would be another example of potential energy   >   stored energy > not moving.

a ball spinning on a finger   >   kinetic energy > moving energy

a ball rolling on the ground   >   kinetic energy   > moving energy

a   ball flying through the air   > kinetic energy   >   moving energy

hope that                                         : )

the answer is c. the lower legs are levers, and the knees are fulcrums. the ankles hold the loads.