Two skaters with masses of 60kg and 48kg , respectively, stand 9.0m apart, each

Question

Two skaters with masses of 60kg and 48kg , respectively, stand 9.0m apart, each holding one end of a piece of rope.

a. If they pull themselves along the rope until they meet, how far does each skater travel? (Neglect friction.) Express your answers using two significant figures separated by a comma.

b. If only the 48kg skater pulls along the rope until she meets her friend (who just holds onto the rope), how far does each skater travel? Express your answers using two significant figures separated by a comma.

Explanation / Answer

(A)   We can solve this using the center mass formula:

cm = (x1m1 + x2m2) / (m1 + m2)

We

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