Question

a 2.0 kg mass is released from rest at the top of a plane inclined at a 20 degree above horizontal. The coefficient of kinetic friction between the mass and the plane is .20. What will be the speed of the mass after sliding 4.0 m along the plane.

Answer 1

First draw a diagram

Answer 2

ok i've gotten that far

Answer 3

alright sum the forces in the y and x directions

Answer 4

so normal force in x is 20 * 9.8 cos 20 and y is 20*9.8 sin 20? is that right? Or what should i do i'm really confused.

Answer 5

\[\sum F_x=ma_x=F_x-f_k\]

\[\sum F_y=ma_y=N-W\]