Uh guys so i forgot everything that i took in physics and now i a question, whats p=mv p stands what?

How would doubling the made of an object change the objects potential energy

In which of the following cases is work being done on an object? question 2 options: pulling a trailer up a hill carrying a box down a corridor suspending a heavy weight with a strong chain pushing against a locked door

The boy of mass 30 kg is at r1= 2 meters from the fulcrum. of the girl is 45 kg, at what r2 must she sit so that they are balanced ?