A bumper car with a mass of 86 kg is traveling at 3.6 m/s. A bumper car with a mass of 98 kg is traveling at 1.6 m/s in the opposite direction. After the collision, the 86 kg bumper car travels at -0.5 m/s. What is the speed of the 98 kg bumper car after the collision?

i don't know that i agree with that but what's the question ?

that would be because of both gravity and friction. so     c

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