Acat chases a mouse across a 1.2 m high table. the mouse steps out of the way, and the cat slides off the table and strikes the floor 1.3 m from the edge of the table.

the answer is 3.1 his answer is wrong mines is right

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