A 0.31-kg stone is held 1.1 m above the top edge of a water well and then droppe
ID: 2093013 • Letter: A
Question
A 0.31-kg stone is held 1.1 m above the top edge of a water well and then dropped into it. The well has a depth of 5.1 m. Relative to the configuration with the stone at the top edge of the well, what is the gravitational potential energy of the stone-Earth system before the stone is released. J Relative to the configuration with the stone at the top edge of the well, what is the gravitational potential energy of the stone-Earth when it reaches the bottom of the well? J What is the change in gravitational potential energy of the system from release to reaching the bottom of the well? J A baseball outfielder throws a 0.150-kg baseball at a speed of 39.2 m/s and an initial angle of 32.0 degree . What is the kinetic energy of the baseball at the highest point JExplanation / Answer
(a) E = mgh = 0.31 x 9.8 x 1.1 = 3.3418 J
(b) E = mgh
= 0.31 x 9.8 x ( -5.1 )
= -15.49 J
(c) E2 - E1 = -18.8356 J
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