The correct statement in this case is that truck b has a higher momentum than truck a.
Momentum (P) is the product of a particle's mass(m) and velocity(v). Momentum is a vector quantity, which means it has a magnitude as well as a direction. According to Isaac Newton's second law of motion, the time rate of change of momentum equals the force acting on the particle.
Thus, we get the formula P = m*v
mass of truck a (ma)= 3000 kg
mass of truck b (mb) = 4500 kg
velocity of truck a (va) = velocity of truck b (vb) = v m/s
The momentum of truck a and truck b should be
Pa = ma * va
Pa = 3000 * v
Pa = 3000v kgm/s
Pb = mb * vb
Pb = 4500 * v
Pb = 4500v kgm/s
Thus we get
Pa < Pb
momentum of truck a is less than momentum of truck b.
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