Three students measured the weight of a ball, their results were: John: 24.3 ± 0.1 g
Mark: 24.3 ± 0.2 g
Peter: 24.3 ± 0.3 g

The most precise student was:

What property is a characteristic of a substance that can be observed and does not change the identity of the substance

Ametal ball with a mass of 0.028 kg is dropped from rest at a height of 1.0 meters above the ground. assuming the energy in the ball is conserved, how much kinetic energy will the ball have when it is 0.5 meters above the ground?

Which car has the most kinetic energy? a. a car of mass 1000 kg with a speed of 3 m/s b. a car of mass 2000 kg with speed 7 m/s c. a car of mass 1000 kg with speed 7 m/s d. a car of mass 2000 kg with speed 3 m/s