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

Which statement best describes how private industry decides where to spend the money on research and development

Look at the potential energy diagram for a chemical reaction. which statement correctly describes the energy changes that occur in the forward reaction?

Identify the correct relation showing that the radius r of the orbit of a moon of a given planet can be determined from the radius r of the planet, the acceleration of gravity at the surface of the planet, and the time τ required by the moon to complete one full revolution about the planet. determine the acceleration of gravity at the surface of the planet jupiter knowing that r = 71 492 km and that t= 3.551 days and r= 670.9 × 10^3 km for its moon europa.