Atruck and a scooter moving with the same velocity colide. why does the scooter fly off?

We know, Momentum is the product of mass and velocity. As velocity is equal, momentum of Truck will be greater as mass of Truck is greater than the scooter. As momentum is greater from truck side, it will transfer the same amount to the scooter, so it flies away

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I believe that the best answer among the choices provided by the question is the first choice, a. increases 
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