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V(t) and x(t)

  • Thread starter joemama69
  • Start date
  • #1
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Homework Statement



an object moves to the right with a constant speed v, the ovbject then enters a region where the resistive force is -bv2, find v(t) & x(t)

Homework Equations





The Attempt at a Solution



Fx = ma = -bv2

v = (ma/-b).5

how do i get t in there
 

Answers and Replies

  • #2
CompuChip
Science Advisor
Homework Helper
4,302
47
You are treating "a" and "v" as independent now.
However, the acceleration is related to the velocity as a = dv/dt.
So your equation is actually:
m dv/dt = - b v2

You are going to have to solve a differential equation.
 

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