Two particles are moving along the x axis. particle 1 has a mass m1 and a velocity v1 = +3.2 m/s. particle 2 has a mass m2 and a velocity v2 = -7.1 m/s. the velocity of the center of mass of these two particles is zero. in other words, the center of mass of the particles remains stationary, even though each particle is moving. find the ratio m1/m2 of the masses of the particles.

Complete these sentences. if a roller coaster train has a potential energy of 1,500 j and a kinetic energy of 500 j as it starts to travel downhill, its total energy isj. once the roller coaster train gets closer to the bottom of the hill, its kinetic energy increases to 1,100 j, and its potential energy decreases to j. when the train reaches the bottom of the track and is traveling along the ground, its kinetic energy isj.

Awave that is traveling fast can be said to have a high a. frequency b. speed c. wavelength d. amplitude e. period f. none of these

The star nearest to our sun is proxima centauri, at a distance of 4.3 light-years from the sun. how far away, in km, is proxima centauri from the sun?