This question involves the concepts of momentum, speed, and mass.
The momentum of the car is "18000 N.s".
The momentum of an object is defined as the quantity of motion contained in that object. Mathematically, momentum is the product of the mass and velocity of an object. Therefore,
P = mv
where.
P = momentum of the car = ?
m = mass of the car = 1200 kg
v = velocity of the car = 15 m/s
Therefore,
P = (1200 kg)(15 m/s)
P = 18000 N.s
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