A uniform log of length 2.50 m has a mass of 91.0 kg and is floating in water. Standing on this log is a 72.0-kg man, located 22.0 cm from one end. On the other end is his daughter (m = 20.0 kg), standing 1.00 m from the end.
a) Find the center of mass of this system.
b) If the father jumps oft the log backward away from his daughter (v = 3.14 m/s), what is the initial speed of log and child?
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