You reach out a second-story window that is 5 m above the sidewalk and throw a 0.1-kg ball straight upward with 6 J of kinetic energy.
a. What is the ball’s gravitational potential energy when it is released?
b. What is the ball’s gravitational potential energy just before hitting the sidewalk?
c. What is the ball’s kinetic energy just before hitting the sidewalk?
d. How would the answer to part (c) change if the ball had initially been thrown straight down with 6 J of kinetic energy?
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