The Momentum of a System of Particles Is Changing at the Rate

Multiple Choice

The momentum of a system of particles is changing at the rate of 0.71 t + 1.2 t², in kg∙m/s.The net force at t = 2.0 s

A) cannot be determined without knowing the masses of the particles.
B) is 5.5 N
C) is 3.1 N
D) is 1.9 N
E) cannot be determined without knowing the momentum at t = 0