A ball of mass 0.125 kg moves with a velocity of 2 m/s. The ball hits another ball of mass 1 kg that is initially at rest. After the collision, the first ball recoils with a velocity of 1.5 m/s. Calculate the velocity of the second mass.

Avolcano erupts next to a grassland area in a valley. a. describe three ways in which material released by the volcano could impact the grassland area. b. describe three ways in which the grassland ecosystem could recover after a volcanic eruption.

Which of the following conditions lead you to see an absorption line spectrum from a cloud of gas in interstellar space? the cloud is extremely hot. the cloud is visible primarily because it reflects light from nearby stars. the cloud is cool and lies between you and a hot star. the cloud is cool and very dense, so that you cannot see any objects that lie behind it.

What is the speed vfinal of the electron when it is 10.0 cm from charge 1?