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:
(THAT WAS THE FIRST PART OF THE QUESTION WHICH I HAVE ALREADY FOUND.)
Calculate the kinetic coefficent of friction between the block and the plank.
The Attempt at a Solution
not sure how but i keep getting: .21766