Lillian wonders how fast a train can move around a particular curve before it falls off of the track. which of the following is the best way for lillian to figure this out?
a. drive a train along a curve at different speeds until it falls off of the track.
b. build a model train and track, and test one train going around one curve at different speeds.
c. build a model train and track, and test one train going around several different curves at one speed.
d. build a model train and track, and test different-sized trains going around one curve at the same speed.