A lumberjack (mass = 98 kg) is standing at rest on one end of a floating log (mass = 240 kg) that is also at--

Question

--rest.
The lumberjack runs to the other end of the log, attaining a velocity of +2.8 m/s relative to the shore, and then hops onto an identical floating log that is initially at rest. Neglect any friction and resistance between the logs and the water.

(b) Determine the velocity of the second log if the lumberjack comes to rest on it.

Answer 1

Since he has speed of 2.8 m/s w/r/t shore it is also w/r/t log 2

using conservation of momentum
98*2.8=338*v
v=98*2.8/338

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