The true statement of this case is truck b has higher momentum than truck a.
We need to know about momentum to solve this problem. Momentum can be defined as the degree of difficulty to stop a moving object. It can be determined by
P = m . v
where P is momentum, m is mass and v is velocity.
From the question above, we know that:
ma = 3000 kg
mb = 4500 kg
va = 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
Pa < Pb
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