Velocity and acceleration in two systems of units 1 and 2 are related as v₂ = n v₁ / m₂ and a₂ =
(a) n a₁ / m₂
(b) n a₁ / m₁
(c) m₁ a₂ / n v₁
(d) m₂ a₁ / n v₁