Passage I
Students conducted an experiment to see how jumping on a merry-go-round affects how fast it spins. In each case an empty spinning merry-go-round was approached by a student who ran in the direction shown in Figure 1 and then jumped on the edge. Several trials, each consisting of three runs, were performed using students of different masses running at different speeds, and different initial spin rates for the merry-go-round, given in revolutions per minute (rpm). The results are shown in Table 1.
3. Suppose that in a fourth run in Trial 4, a student had jumped on the merry-go-round and the final spin rate was 13.30 rpm. The student's mass would most likely have been:
Your Answer is
Correct Answer is C
Explanation
Observing trail4, whenever a student's mass increases by 10kg, the spin rate increases by 0.6. Spin rate13.3 is 0.6 higher than 12.7 when the mass is 40kg, which means that the mass should be 10 higher.