A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is
A. zero.
B. twice.
C. four times as much.
D. unchanged.
Answer:B
A freight train rolls along a track with considerable momentum. If it rolls at the same speed but has twice as much mass, its momentum is
A. zero. B. twice. C. four times as much. D. unchanged.