Which statements describe the motion of a planet according to Kepler’s second law? Check all that apply. The speed of a planet varies as it moves in its orbit.
The speed of a planet is constant as it moves in its orbit.
A planet travels the same distance along its orbit in equal units of time.
A planet sweeps out an equal area in equal units of time.
A planet’s orbit is a circle centered on the Sun.
A planet’s orbit is an ellipse with the Sun at one focus.

Atank holds 1000 gallons of water, which drains from the bottom of the tank in half an hour. the values in the table show the volume v of water remaining in the tank (in gallons) after t minutes.t(min) 5 10 15 20 25 30v(gal) 694 444 250 111 28 0(a) if p is the point (15, 250) on the graph of v, find the slopes of the secant lines pq when q is the point on the graph with t = 5, 10, 20, 25, and 30.(b) estimate the slope of the tangent line at p by averaging the slopes of two secant lines.(c) use a graph of the function to estimate the slope of the tangent line at p. (this slope represents the rate at which the water is flowing from the tank after 15 minutes.)show all steps.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.

Suppose you plot the distance traveled by an object at various times and you discover that the graph is not a straight line. what does this indicate about the object's acceleration?