A 4 kg crate slides down a ramp.the ramp 2.9 m in length and incline at an angle of 35 degress.the crate start from rest at the top and has a friction force of 3 n.what is the speed of the crate

Answer 1

Better, what is the net force on the crate.

friction force up ramp: 3N
gravity force down ramp: mg*sin35

net force=gravity-friction = mass*acceleration

so acceleration= netforce/mass

Vf^2=Vi^2 + 2*acceleartion*distance