Suppose that two objects collide. Which of the following things is not the same both before and after the collision?

Which of the following is an example in which you are traveling at constant speed but not at constant velocity?

The acceleration of gravity on Earth is approximately 10 m/s 2 (more precisely, 9.8 m/s 2). If you drop a rock from a tall building, about how fast will it be falling after 3 seconds?

The total number of stars in the observable universe is about

What is the difference between energy and power?

The greater the wavelength of light, the greater its energy.

If you are driving at 30 miles per hour and increase your speed to 60 miles per hour, you quadruple your kinetic energy.

All galaxies beyond those local to the Milky Way appear to be receding from us.

Modern telescopes are capable of seeing bright galaxies up to about

Grass appears green because