A8 kg cat is running 4 m/s how much kinetic energy does it have

Aspring has a natural length of 8 m. if a 12-n force is required to keep it stretched to a length of 10 m, how much work w is required to stretch it from 8 m to 16 m? (round your answer to two decimal places.)

Why do different substances have diffrent properties

Which system of units is used by only a small number of countries in the world, including the u.s.