Ahot ball of gas in outer space that creates its own energy is called a
a. star
b. comet
c. planet
d. black hole

Abumper car with a mass of 250 kg is traveling at a speed of 4 m/s. this bumper car collides and sticks to a second bumper car with a mass of 250 kg, which is initially at rest. what is the final speed of these two bumper cars after the collision, assuming they remain stuck together?

Iso need with this one really lost on it me on this

Many scientists like to study cosmic objects in the uv spectrum because objects giving off large amounts of uv light are typically and