A 100-Kg Piano Rolls Down a 20° Incline

question 6

Multiple Choice

A 100-kg piano rolls down a 20° incline.A man tries to keep it from accelerating, and manages to keep its acceleration to 1.2 m/s².If the piano rolls 5 m, what is the net work done on it by all the forces acting on it?

• A)60 J
• B)100 J
• C)600 J
• D)1000 J
• E)4900 J

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