physics (emergency!)

How much work is required to stop an electron (m = 9.11 10-31 kg) which is moving with a speed of 1.99 106 m/s?

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asked by maddie
  1. It is equal to the kinetic energy of the electron.

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  2. how do you find the kinetic energy though?

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    posted by maddie
  3. 0.5*mass*velocity squared

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

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    posted by maddie
  5. the kinetic energy on e- is negative

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    posted by brian

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