1. The problem statement, all variables and given/known data 2 small metal spheres of the same size but made of aluminium and brass are released simultaneously from rest inside a tall vessel filled with a viscous liquid.Consider the following statements A) Upthrusts on both spheres are the same B)The initial accelerations of both spheres are the same C)Both spheres will attain the terminal velocity at the same depth. Of the above statements (1)only A is true (2) only B is true (3)only C is true (4)only A and B are true (5) all A,B and C are true (answer given is (1) ) 2. Relevant equations Upthrust = mg = V*rho*g ? 3. The attempt at a solution I first thought only B was true.that the initial accelerations would be the same,but I guess the initial accelerations would depend on their weights which are not equal so the initial accelerations cannot be the same? But I don't get why A is true.Doesn't upthrust depend on the weight of the spheres which are different in this case,but if we consider=V*rho*g ,the upthrusts would be the same since the volumes and the density of the liquid are the same ?Why the difference? And just to verify, C ) is wrong cause the initial accelerations are different ,therefore the initial velocities of the spheres are different,so they would attain terminal velocity at different depths?