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MG's point is that the KE is proportional to the square of the velocity.
But yes, a vehicle with more mass will also have more KE, but in direct proportion.
Yes, but since not all of the KE will be transferred to the person, conservation of momentum is the more relevant issue.
EDIT: Actually I suspect that the vehicle design is probably very relevant as well.
ffm
NotThamesWater
MG's point is that the KE is proportional to the square of the velocity.
But yes, a vehicle with more mass will also have more KE, but in direct proportion.