Students then discuss the mechanical energy of the marble after it has been launched by the cannon but before it reaches the ground, Both students agree that air resistance is negligible and make the following claims. Student 1: There are two external forces exerted on the marble while it is in the air, the gravitational force and the force exerted by the cannon. Therefore, the mechanical energy of the marble changes while it is in the air. Student 2: The cannon does not exert a force on the marble afterthe launch. Therefore, the mechanical energy of the marble is constant. (e) Which underlined phrase or phrases in student 1's statement are correct, if either? If neither phrase is correct, write "none." BIHXZXZOGQEE mm 0 /'lOOOO Word Limit (1') Which underlined phrase or phrases in student 1's statement are incorrect, if either? If neither phrase is incorrect. write "none." 0 ITOOOO Word Limit (Q) Which underlined phrase or phrases in student 2's statement are correct, if either? If neither phrase is correct, write "none." 0 / 10000 Word Limit (h) Which underlined phrase or phrases in student 2's statement are incorrect, if either? If neither phrase is incorrect, write "none." BquzxzbcnsEEE 0 / 10000 Word Limit This question is a long free-response question, Show your work for each part of the question, (15 points, suggested time 25 minutes) Cannon Marble Mass = M __ C Mass = mm ill/Z3\"\\ J: _: . Note: Figure not drawn to scale. Students launch identical marbles of mass mm horizontally from a toy cannon of mass MC, where MO > mm, as shown above, The cannon can be adjusted to change the launch speed 11 of the marble relative to the ground. Each time a marble is launched, the cannon slides backward before coming to rest. The coefcient of kinetic friction between the cannon and the ground is ,u, (mu). For each launch, the students vary the launch speed '0 and record the distance at the cannon slides backward for each launch speed