2. A puck is slid from one corner of the rink at an angle of 70° with respect to the goal line at a speed of 35 m/s. If the blue line is 20 meters from the goal line, how
long would it take for the puck to cross the line. If the rink is 60 meters wide,
determine how long it would take for the puck to hit the side boards.
Goal Line
Blue line

The independent variable is the different amounts salt that will be added to the water (what is done by the scientist). The dependent variable is the boiling temperature of the water (what is being measured). the independent variable is manipulated or changed by the experimenter to measure the effect of this change on the dependent variable.