Which of these is a qualitative observation? a. The boy is 5 feet tall.
b. There are six birds in the tree.
c. The birds are tiny.
d. There are more blue birds than black birds.

The twister and runaway train are two coasters at the same amusement park. both coasters start at the same height. the coaster for the twister is twice the mass of the coaster for the runaway train. which roller coaster has greater gravitational potential energy at the start of the ride?