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## Homework Statement

A block is at rest on a plank whose angle can be varied. The angle is gradually increased from 0 deg. At 25.7°, the block starts to slide down the incline, traveling 3.50 m down the incline in 1.50 s. Calculate the coefficient of static friction between the block and the plank.

Motion of a block:

4.81×10-1

(THAT WAS THE FIRST PART OF THE QUESTION WHICH I HAVE ALREADY FOUND.)

Part 2:

Calculate the kinetic coefficent of friction between the block and the plank.

## Homework Equations

None.

## The Attempt at a Solution

not sure how but i keep getting: .21766