Will upvote every answer! multiple choice question!

when a piece of paper is crumbled, this is a change of
a. shape
b. density
c. state
d. mass

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?

In science and physics what is the standard unit of measure for speed?

Acamcorder has a power rating of 20 watts. if the output voltage from its battery is 9 volts, what current does it use?