physics

i posted this before but no one answered. please help me:

A net force of 1.6×10−15 N acts on an electron over a displacement of 5.0 cm, in the same direction as the net force. (a) What is the change in kinetic energy of the electron? (b) If the electron was initially at rest, what is the speed of the electron? An electron has a mass of 9.1×10−31 kg.

part a should be in joules.
part b should be in meters per second.

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  1. the answer to A is 8X10^/17. You get this by using the work formula, which is the same as change in KE. I don't know how to get B

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