A small sealed container of mass 0.80kg and volume 1.00×10−3m3 is released from rest while fully submerged in water. What is the magnitude and direction of its initial acceleration? (Use g=9.8m/s2 and water density 1.0×103kg/m3.)
(a) 9.8m/s2 upward
(b) 2.5m/s2 upward
(c) 2.5m/s2 downward
(d) 2.0m/s2 upward