A ball with the mass of 2 kg is moving at the speed of 3 m/s. what is the ball's kinetic energy

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Astudent carefully transfers 30 g of water and 30 g of alcohol in a glass tube, forming two layers and filling the tube completely. after sealing the tube, the student mixes the solutions, and notices a bubble that forms in the tube. what is the mass of the contents in the glass tube after mixing?

The mass of a neutron is equal to the mass of a proton plus the mass of an electron. true or false false true