Solving SAT Physics: Momentum of Block Starting from Rest at 5s

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Homework Help Overview

The discussion revolves around a physics problem related to momentum, specifically focusing on a block starting from rest and its momentum after 5 seconds. The subject area includes concepts of momentum, force, and kinematics.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants explore the relationship between momentum and force, questioning the completeness of the problem statement. There are attempts to derive momentum using the equation p=mv and discussions about the implications of a constant force.

Discussion Status

The discussion is ongoing, with participants raising questions about the clarity of the problem and the assumptions involved. Some guidance has been provided regarding the use of force and its relationship to momentum, but no consensus has been reached on the problem's requirements.

Contextual Notes

There is uncertainty regarding the completeness of the problem statement, as well as the assumptions about the force acting on the block. The mention of a specific answer (10 kg m/s) raises questions about how that value is derived without additional information.

spyroarcher
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Homework Statement


If the block starts from rest, its momentum at 5 seconds is...


Homework Equations


p=mv
F=ma
v=at


The Attempt at a Solution


When I thought about it, I was thinking about p=mv, and I had to substitute v to get a desirable answer. So I did p=m(at). However I only know the time, and I know the answer is 10 kg m/s, but I am not sure how to do it. Thanks in advance.
 
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"If the block starts from rest, its momentum at 5 seconds is..."

Is that the full question? If so, there is no answer.
 
Yes that is the full question, if it is impossible, how would the book get 10?
It also said p=F(change in T) for the answer
 
Sure, F=dp/dt, so ∆p=∫Fdt. If you have a constant force of 2N acting on the particle you will get ∆p=F∆t=2*5=10 kgm/s, but I don't see anything about that.
 

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