Two kids are on roller skates standing facing each other. They push off one another and travel in opposite directions. If the boy has a mass of 60 kg and is going 5.6 m/s, and the girl is going 7.1 m/s, what is the mass of the girl? kg

Acatapult is tested by roman legionnaires. they tabulate the results in a papyrus and 2000 years later the archaeological team reads (distances translated into modern units): range = 0.4 km; angle of launch = π/5 rad; landing height = launch height. what is the initial velocity of launch of the boulders if air resistance is negligible?

8. why do radio telescopes convert radio waves (analog signals) to electrical (digital) signals for analysis? (hint: what did the article say about the advantages of digital signals? )

A17,250 kg rocket is pushed with a thrust of 6,450,284 n. what is the acceleration of the rocket?