While sliding across a horizontal surface (with a uniformcoefficient of friction

Question

While sliding across a horizontal surface (with a uniformcoefficient of friction across the
entire surface), a hockey puck slows down due to friction, andcomes to rest after 20.0 seconds.
a) How does the change in energy in the first 10 seconds compare tothe change in energy in the
last 10 seconds? Choose ONE of the following.
A. first half > second half
B. first half = second half
C. first half < second half
D. too little information
Please explain your choice using clear and complete sentences.
b) The puck has a mass of 170 g, an initial velocity of 47m/s andthe coefficient of friction is
k=.2398 . Find the change in kinetic energy in during thefirst 10.0 seconds and compare it with
the change in kinetic energy during the last 10.0 seconds.Reconcile your answer with your
answer to the question above.

Explanation / Answer

While sliding across a horizontal surface (with a uniformcoefficient of friction across the entire surface), a hockey puck slows down due to friction, andcomes to rest after 20.0 seconds. a) How does the change in energy in the first 10 seconds compare tothe change in energy in the last 10 seconds? Choose ONE of the following. A. first half > second half B. first half = second half C. first half second half

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