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## Homework Statement

In nanoscale electronics, electrons can be treated like billiard balls. The figure shows a simple device currently under study in which an electron elastically collides with a rigid wall (a ballistic electron transistor). The green bars represent electrodes that can apply a vertical force of 7.60·10-13 N to the electrons. If an electron initially has velocity components vx = 1.30·105 m/s and vy = 0 and the wall is at 45°, the deflection angle θD is 90°. How long does the vertical force from the electrodes need to be applied to obtain a deflection angle of 131°?

## Homework Equations

Force*Delta.Time = Mass*Delta.Velocity

## The Attempt at a Solution

I've spend a long time trying to figure this out. I'm trying to set Force*Delta.Time = Mass*Delta.Velocity.

I know that the mass is 9.11 10^-31, the force is 7.60·10-13, and I need to find the velocity to solve for the time.

I'm not sure how to find the velocity.

Thanks for any help.