PLS ANSWER FAST WILL GIVE BUT ONLY IF YOU KNOW what happens outside of the nucleus?

An object has a weight of 500 on earth what is the mass of this object

Consider a system with two masses that are moving away from each other. why will the kinetic energy differ if the frame of reference is a stationary observer or one of the masses?

Friction removes energy from objects in motion. which statement best describes how this works? a) friction transforms ke into thermal energy b) friction transfers thermal energy to ke c) friction transforms te into pe d) friction transforms pe into ke e) friction transfers ke into pe