Which of the following statements are true? A) Mechanical energy is conserved because no dissipative forces perform work on the ball. B) The forces of gravity and the spring have potential energies associated with them. C) No conservative forces act in this problem after the ball is released from the spring gun.

An object thrown vertically upward from the surface of a celestial body at a velocity of 36 m/s reaches a height of sequalsminus0.9tsquaredplus36t meters in t seconds. a. determine the velocity v of the object after t seconds. b. when does the object reach its highest point? c. what is the height of the object at the highest point? d. when does the object strike the ground? e. with what velocity does the object strike the ground? f. on what intervals is the speed increasing?

Explain earth's motion, using the terms "precession" and "rotation" in your answer.

Explain the comparisons between nature and packingtown that appears on pages 81 and 82 answer