Calculate the average acceleration of a car with a starting velocity of 0 m/s2 that accelerates to 9 m/s2 in 3 seconds.

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?