Algebraic expressions for the amount of time that elapses

[emily081715]

Homework Statement

A single gas molecule of inertia m is trapped in a box and travels back and forth with constant speed v between opposite walls A and B a distance l apart. At each collision with a wall, the molecule reverses direction without changing speed.Write algebraic expressions for the amount of time that elapses between collisions with wall B.

Homework Equations

Δp=-2mv

The Attempt at a Solution

i know that the equation does not depend on mv, and must involve l and v. I believe that the equation should be something along the lines of 2lv. can anyone work through this to make sure it is correct with me

 

[RUber]

v is given in distance/time, so an expression for time would require distance divided by v to get units in time.

 

[emily081715]

v is given in distance/time, so an expression for time would require distance divided by v to get units in time.

thank you i already solve the question on my own though