Physics question, ?

a cue ball with mass 170 g hits the stationary number 8 ball, which has mass 160 g. the cue ball and the 8 ball move with a speed of 0.2 m/s and 0.3 m/s respectively after the collision. what was the speed of the cue ball before the collision?

a) 0.2502 m/s
b) 0.4823 m/s
c) 0.5008 m/s
d) 0.5319 m/s

What best describes a sonar wave? transverse and electromagnetic transverse and mechanical longitudinal and electromagnetic longitudinal and mechanical

Rank the automobiles based on the magnitude of the force needed to stop them, from largest to smallest.2000 kg car going 5m/s500 kg car going 20 m/s1000 kg car going20m/s500 kg car going10m/s1000 kg car going10/s4000 kg car going 5m/s 0 0 603

The man of mass m1 and the woman of mass m2 are standing on opposite ends of the platform of mass m0 which moves with negligible friction and is initially at rest with s = 0. the man and woman begin to approach each other. derive an expression for the displacement s of the platform when the two meet in terms of the displacement x1 of the man relative to the platform.