How to solve acceleration in function of velocity

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Homework Help Overview

The problem involves determining various aspects of a particle's motion given its acceleration as a function of velocity, specifically a = -10v. The initial condition is that the velocity at time t=0 is 30 m/s. The questions focus on the distance traveled before coming to rest, the time required to come to rest, and the time to reduce the velocity to 1 percent of its initial value.

Discussion Character

  • Exploratory, Assumption checking, Mathematical reasoning

Approaches and Questions Raised

  • Participants discuss the relationship between acceleration and velocity, with one suggesting the use of separation of variables to solve the differential equation. Another participant notes a solution for one of the questions but expresses uncertainty about the others.

Discussion Status

The discussion is ongoing, with participants exploring different aspects of the problem. One participant has derived a solution for the velocity as a function of time but indicates that it does not provide answers for all parts of the problem. There is a suggestion to focus on the third part for a finite answer.

Contextual Notes

There is a mention of the time being infinite for certain calculations, which raises questions about the assumptions made regarding the limits of integration and the physical interpretation of the results.

ahmdo
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Homework Statement



the acceleration of aparticle is defined by the relation a=-10v , where a is expressed in m/s2 and v in m/s knowing that at t=0 the velocity is 30 m/s
determine
(a) the distance the particle will travel before coming to rest
(b) the time required for the particle to come to rest
(c) the time required for the velocity of the particle to be reduced to 1 percent of its initial value

Homework Equations



a=dv/dx or vdv/dx

The Attempt at a Solution



hmm well I am not sure how to solve acceleration in function of velocity
 
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You know that a= dv/dt

so you have dv/dt = -10v.

Apply separation of variables. Do you know how to do this?
 


i did and i got v=30e^-10t
so the first and second questions has no answers...it can solve the 3rd one only
 


well you can't get a time as the time would be infinite, you can get the distance integrating with infinity as a limit.

I'd suggest you do the third part seeing as that will give a finite answer.
 

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