Two billiard balls, each with a mass of 0.35 kg, strike each other head-on. one ball is initially moving left at 4.1 m/s and ends up moving right at 3.5 m/s. the second ball is initially moving to the right at 3.5 m/s. find the velocity of the second ball.

Using software, a simulation of a javelin being thrown both on earth and on the moon is created. in both cases, the velocity and angle of projection are kept the same. on earth, the javelin covers a distance y. what distance would it cover on the moon? (the moon’s gravity is about 1/6th that of earth.) a. 6y b. 6/y c. y/6 d. (y+6)2

What is the mass of the same rock on the earth

Which of the following are forms of phase changes a. freezing b. condensation c. heating d. exchanging