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Q. How much Power does it take to accelerate a 70,000 lb rail car from rest to 10mph in 20 feet with 1ft dia. wheels?

Q. A uniform electric field of magnitude 450 N/C pointing in the positive x-direction acts on an electron, which is initially at rest. The electron has moved 3.10 cm.

(a) What is the work done by the field on the electron?

(b) What is the change in potential energy associated with the electron?

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