A0.060-kg tennis ball, initially moving at a speed of 12 m/s, is struck by a racket causing it to rebound in the opposite direction at a speed of 18 m/s.

what is the change in momentum of the ball?
a) 0.72 kg·m/s

b) 0.36 kg·m/s

c) 1.1 kg·m/s

d) 1.8 kg·m/s

b.a device that inputs heat into a cool object

statement #3 on andre"s list is false.

it's when something is going so fast it makes a loud noise, breaking the sound barrier, for example: a jet makes a loud noise, not only cause of the jet but because they reached a point where they went so fast that you can year the noise from various parts, kinda like a police car, lets say the car was going   so fast that you hear the siren of the cop car right next to you, but the car is probably a mile a way, it's cos the siren was next to you a few seconds if you understand me

total distance/total time

(85 + 82)/(5+3)

167/8

20 just over