A rope is wound around a hollow cylinder and another is wound around a solid cylinder. The surfaces of the cylinders have some friction. The solid cylinder is 20 times heavier than the hollow cylinder. The ropes are pulled with a constant force of 50 N. Assume that the cylinders acquire an equal angular acceleration. The number of turns on the hollow cylinder is four. If the radius of each cylinder is 14 cm, then what is the length of the rope wound around the solid cylinder?

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

false.

explanation:

this statement is false. after falling for 5 seconds, its speed will not be 100 m/s.