- #1

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## Homework Statement

See the attachment Q5

## Homework Equations

## The Attempt at a Solution

Let's begin with part (a) first.

After finishing this homework (see the second attachment), I suddenly noticed 1 thing. The friction will gradually decrease to zero and then change the direction to become same as the motion direction.

Therefore, my work on part (a) would be wrong. Since I assume the friction is a constant (mgμsinθ).

How do I fix it?

And also, is my way to find the minimum coeff of kinetic friction correct?

And for part (b), it is really that easy?