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**1. Homework Statement**

An electron of mass 9.11 multiplied by 10^-31 kg has an initial speed of 4.00 multiplied by 10^5 m/s. It travels in a straight line, and its speed increases to 7.00 multiplied by 10^5 m/s in a distance of 5.00 cm.

(a) Assuming its acceleration is constant, determine the force exerted on the electron.

(b) What is the ratio of this force to the weight of the electron, which we neglected?

**2. Homework Equations**

i think you need some kinematics equations not sure though

**3. The Attempt at a Solution**

havent figured out where to start

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