Hi Texasgirl03,
Take a look a the diagram and see if it makes the problem any clearer.
Notice that there's two forces acting upwards the Normal force (N) & the y component of the 150N force (Ty), and one force pulling downwards (Fg). Find Ty and remember that according to Newton's Second Law...
Hi elkosp16, you need to use the formula :
Δ X = Vi*T + (1/2)*a*T^2
You already know displacement (ΔX), 85 cm (remember to convert it to meters !)
Initial velocity (Vi) is 0, because it starts at rest.
Time = .50 seconds,
Plug everything in and solve for a,
once you get acceleration, use...