physics (emergency!)
posted by maddie on .
How much work is required to stop an electron (m = 9.11 1031 kg) which is moving with a speed of 1.99 106 m/s?

It is equal to the kinetic energy of the electron.

how do you find the kinetic energy though?

0.5*mass*velocity squared

I tried that but the answer I came up with was incorrect... Are you sure that's the right way to solve this?

the kinetic energy on e is negative