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**1. A 2.0 kg otter starts from rest at the top of a muddy incline 85 cm long and slides down to the bottom in 5.0 s. What net force acts on the otter along the incline.**

2. Homework Equations - F=ma, maybe some more too.

3. The Attempt at a Solution

I attempted this question for one and a half hour, but I couldn't get it. This is coming in my exam TOMORROW, but I just don't get it.

The answer is 14.0 N, but I just don't know how to get it. And it's too late to ask help from a school teacher. I've done this question before, but someone took my physics copy to copy all the assignments and never gave it back...

Now I don't know what to do.