The mass of a given object varies inversely as the acceleration of the object. A cart with a mass of 40 g has an accelerationo 2.5 m/s^2. What is the acceleration of a 50 g cart?

F = M*a = 0.04 * 2.5 = 0.1 N.

a = F/M = 0.1/0.050 = 2.0 m/s^2