The two masses in the figure are released from rest. After the 3.0-kg mass has fallen 1.5 m, it is moving with a speed of 3.8 m/s. What is the change in mechanical energy done on the system during this time interval by the frictional force on the 2.0 kg mass?
a.
?12 J
b.
?17 J
c.
?20 J
d.
?8.0 J
e.
?28 J
d
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