Solve Velocity Problem: Boat w/ 2 Boys Jumping

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Homework Help Overview

The problem involves a boat moving at a certain velocity with two boys jumping off in different directions, raising questions about the resulting velocity of the boat after the jumps. The subject area pertains to momentum and its conservation in a system involving multiple masses.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • The original poster attempts to calculate the resulting velocity of the boat by considering the momentum of the boys as they jump off. Some participants question the understanding of momentum versus force and seek clarification on the mass of the boat.

Discussion Status

The discussion is ongoing, with participants exploring the calculations and definitions involved. There is a recognition of the boat's mass, which was initially missing, and some guidance has been offered regarding the distinction between momentum and force.

Contextual Notes

The mass of the boat was not initially provided, which may affect the calculations and assumptions being made. Participants are navigating through the implications of this missing information.

alex engler
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a boat is moving at 3 meters/sec one boy wieghs 65 kgjumps off the front at 2 m/s. the second boy jumps out of the back of the boat, he wieghs 68kg and jumps at a speed of 4 m/s. if the boats mass is 100kg. what is the velocity of the boat.


what i did was multiply 65 times 2 to get the force that the 1st bot jumped of the boat a. i got 130kg m/s. then i did the same for the second boy but i used 68 and 4 and got 272kg m/s. i subracted 130 from 272 and got 142. after that i added up the masses of the two boys and got 133. i divided 142 by 133 and got 1.06 i added the initial 3 m/s and got 4.06. Is this right? it seemed too easy.
 
Last edited:
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(mass X velocity) is momentum, not force.

Did they give you the mass of the boat?
 
no it wasn't given
 
ooops the boat was 100 kg.
 

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