Passage III
Suppose a ball is dropped from a height H above a horizontal surface. The ball falls straight down until it collides with the surface; then it bounces straight up, attaining a maximum height y before it begins to fall again. The coefficient of restitution, C, for the collision equals 
.
Therefore:
y=CH
Physics students went to a high-altitude laboratory conduct studies of C for various balls bouncing off different horizontal surfaces. The air temperature and air pressure were constant in the laboratory throughout the studies.
Study 1
The students dropped a racquetball from various H onto a particular horizontal surface, and after each drop they measured y. Then they graphed y versus H(see Figure 1); C equaled the slope of the graph.
Study 2
The students repeated the procedure in Study 1 and determined C for various balls dropped onto both a bare concrete surface and a concrete surface covered with a thin layer of foam. Both surfaces were horizontal. The results are given in Table 1.
13. Suppose, in an additional trial in Study 2, the students had dropped a ball onto the bare concrete surface, and the ball stuck to the surface without bouncing. C for this collision would have equaled what value?
Your Answer is
Correct Answer is A
Explanation
Not popping up means y=0. The formula y=CH has been given in the article, so when y, C=0