I NEED HELP PLS ASAP IM LITERALLY CONFUSED? What does the force of gravity do to objects?
A. It makes them float.
B. It makes them jump.
C. It pulls them together.
D. It pushes them apart.

What would the difference of spectral lines emitted by hydrogen gas in distant galaxies which is normally found at a wavelength of 21 cm on earth, be observed at 21.1 centimeters?

Standing side by side ,you and a friend step off a bridge at different times and fall for 1.6s to the water below.your friend goes first,and you follow after he has dropped a distance of 2.0m.when your friend hits the water,is the seperation between the two of you 2.0m or more than 2.0m? verify your answer with a calculation.

Alfred pushes on a heavy box, but cannot move it. the box has a lot of inertia motion friction gravity