Which is a "big idea" for space and time?

Work = force × a. work b. energy c. distance d. momentum

Agroup of students were investigating the force of gravity. they began by dropping a foam ball from a height of 3 meters into a bucket of sand. the ball hit the sand in 0.306 seconds. they dropped additional balls of approximately the same diameter, but of different masses. here is the data they collected. based on this experiment and the collected data, what would their conclusion be?

Acertain radio station broadcasts radio waves that have a wavelength of 298cm what is its broadcast frequency?