One of Darren's model cars keeps rolling off its track. The other cars stays on the track. What should he do?

Question

a) change the shape of the track
b)study the wheels of the car that will not stay on the track
c)change the tires on all of the cars
d)build a model of the cars and the track to use in experiments

Answer 1

I would use d.

Answer 2

Thanks Dr.Bob222