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The magnitude of the change in momentum of the driver is 3900kgm/s.
Hence option D) 3900 kg • meters per second is the correct answer.
Momentum is simply the product of the mass of an object and its velocity.
Its is expressed as;
P = m × v
Where m is the mass of the object and v is its velocity.
Given the data in the question;
We substitute the given values into the expression above to determine the initial momentum of the driver before he was brought to rest.
P initial = m × v
P initial = 125kg × 31m/s
P initial = 3875 kgm/s ≈ 3900kgm/s
Now, as the driver is brought to rest, final velocity becomes zero
P final = 125kg × 0
P final = 0
This means that the change in momentum of the driver is his initial momentum which is 3900kgm/s.
Therefore, the magnitude of the change in momentum of the driver is 3900kgm/s.
Hence option D) 3900 kg • meters per second is the correct answer.
Learn more about momentum here: brainly.com/question/14952164
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