A lumberjack (mass = 98 kg) is standing at rest on one end ofa floating log (mas

Question

A lumberjack (mass = 98 kg) is standing at rest on one end ofa floating log (mass = 245 kg)that is also at rest. The lumberjack runs to the other end of thelog, attaining a velocity of +3.8 m/s relative tothe shore, and then hops onto an identical floating log that isinitially at rest. Neglect any friction and resistance between thelogs and the water. (a) What is the velocity of the first log just before thelumberjack jumps off? (Indicate the direction of the velocity bythe sign of your answers.)


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

(a) What is the velocity of the first log just before thelumberjack jumps off? (Indicate the direction of the velocity bythe sign of your answers.)


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

Explanation / Answer

(a) Whatis the velocity of the first log just before the lumberjack jumpsoff? (Indicate the direction of the velocity by the sign of youranswers.)
according to conservationof momentum
98*3.8=245*v
so v=1.52m/sec



(b) Determine the velocity of the second log if the lumberjackcomes to rest on it.
in the same way
velocity attained by the second log=1.52m/sec

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