In order to measure the horizontal range, the student watched to see where the marble hit the ground. Suggest an improvement to the experiment to determine more accurately where the marble hit the ground. Suggest another variable that could be investigated, which may affect the horizontal range of a marble. 11) Describe experimental work that could be carried out to investigate how the variable you suggested in (b) (1) affects the horizontal range of a marble. A student is investigating factors that affect the horizontal range of a marble, using the apparatus shown. release height ramp horizontal range