Asoccer ball is traveling at a velocity of 50 m/s. the kinetic energy of the ball is 500 j. what is the mass of the soccer ball? (formula: ).

0.4 kg

Explanation:

Information given;

Mass of ball = ?

Velocity = 50 m/s

Kinetic Energy = 500J

The formular relating these parameters is given as;

K.E = 0.5 * Mass * Velocity²

500 = 0.5 * M * 50²

M = 500 / (0.5 * 50 * 50)

M = 500 / 1250

M = 0.4 kg

answer; i believe the correct answer is (solid gold);

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.