Science, who ever answers this will get a brainlest

Which best represents the law of conservation of mass ?

Asap i'm in class rn a 1,000-kg car is traveling 20 m/s on a flat stretch of road. it gets to a hill and coasts uphill until it stops. how high up the hill does the car travel? givens: equation: 1/2mv2initial=mghfinal solve for h. plug & chug, label.

Scientific models are based on current knowledge, which can limit their effectiveness when new discoveries are made.