If you set up an experiment with two different independent variables, then the results would
a) inconclusive; you would not know which of the two variables caused the change.
b)definitive; the results would be more accurate if you change the two variables at a time.
c) conclusive; showing a strong correlation between dependent and independent variables.
d) somewhat conclusive, you know the change resulted from one of the variables.

You have been hired to design a spring-launched roller coaster thatwill carry two passengers per car. the car goes up a 10-m highhill, then descends 15m to the track's lowest point. you'vedetermined that the spring can be compressed a maximum o 2.0m andthat a loaded car will have a maximum mass of 400kg. for safetyreasons, the spring constant should be 10% larger than the minimumneeded for the car to just make it over the top. a) what spring constant (k) should you specify ? b) what is the maximum speed of a 350 kg car if the spring iscompressed the full amount.