- #1

Mdhiggenz

- 327

- 1

## Homework Statement

The mass of a proton is 1836 times the mass of an electron.

A) A proton is traveling at speed . At what speed (in terms of ) would an electron have the same kinetic energy as the proton?

B) An electron has kinetic energy K . If a proton has the same speed as the electron, what is its kinetic energy (in terms of K )?

## Homework Equations

## The Attempt at a Solution

The answer for A is 42.85, and to get it here is what I did.

Kp-ke=0

Kp=Ke

1/2mv^2=1/2(1836m)v^2

Ve=squareroot(2*918vp)=42.85

Part B the answer is 1836

But I have no clue on how to get it. Since their velocities are equal I was thinking of setting them both to 1.

1/2m(1)^2=1/2(1836m)(1)^2

I don't know what to do after this.. tried solving for M but that doesn't make sense.

Thank you