A student rolled a toy car down a ramp and timed how long it took to reach the bottom. After one trial, the student doubled the height of the ramp and added sandpaper to its surface. The student conducted three more trials. After reviewing the data, the student concluded the height of the ramp had no effect on the speed that the car traveled.Which is the most likely reason this conclusion is flawed?

Question

A. More trials were needed during the investigation.

B. The student misunderstood how to calculate speed

C. A control should have been added to the investigation

D. Too many variables were changed during the investigation.

Answer 1

Okay,
the student obviously changed too many variables during the trials

Answer 2

Thankyou so much for your help

Answer 3

No problem