**Problem 4:**A 200 kg cart is initially at rest on a flat, horizontal track. The cart has a charge of 0.001 C, and it is initially 2 m in front of another (fixed) positively charged post (also 0.001 C). 38 m in front of the cart is a negatively charged post (-0.001 C). And so, being repelled from the positive post and being attracted to the negative post, the cart accelerates toward the negative post in front of it.However, this cart experiences a constant, frictional force over the last 5 m of its journey and eventually stops only 2 m away from the negative post. What is the magnitude of this frictional force?

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Answered: 4) A 200 kg cart is initially at rest…

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