All particles made of quarks are called .

electrons
gluons
hadrons
nucleons

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?

Arock collection comes from which part of earth?

Idon’t quite understand this problem