Which of the following statements supports the claim that a planet travels around a star in an elliptical orbit? (1 point) Every 30 days, the area swept in space by the planet is the same.
Every 30 days, the distance traveled by the planet is different.
Every 30 days, the speed the planet is moving is different.

I only

I and II

II and III

I, II, and III

Aplane travels 1000 miles in 5 hours .what is the planes average speed?

Three different objects, all with different masses, are initially at rest at the bottom of a set of steps. each step is of uniform height . the mass of each object is a multiple of the base mass : object 1 has mass 4..00m , object 2 has mass 1..96m , and object 3 has mass . when the objects are at the bottom of the steps, define the total gravitational potential energy of the three-object system to be zero. if the objects are then relocated as shown, what is the new total potential energy of the system? each answer requires the numerical coefficient to an algebraic expression. each algebraic expression is given using some combination of the variables , , and , where is the acceleration due to gravity. enter only the numerical coefficient. (example: if the answer is 1..23mgd , just enter 1.23)

What is the measurement of how fast an object moves relative to a reference point?