A roller coaster speeds along a track with considerable momentum. Of a different rollercoaster travels at four times the speed but half as much mass, its momentum is:

what I have not understood

1/0.14nm = 10^10/1.4 a lot

first thing first of the answer is with technology. second thing second thing is that the big bang theory did not happened u see they say it did but what they dont realize is that like dinasures are still a round they might deny it but they and look at these 12 foot human skelteons they find lets see didnt the bible say something about giants. hope this peace.