With these questions. all questions are in the image.

μ ≈ 0.238

a ≈ 0.441 m/s²

Explanation:

a) F = ma  (a = 0 constant velocity)

Fcosθ - μN = 0

μ = Fcosθ / N

μ = Fcosθ / (mg + Fsinθ)

μ = 310cos20 / (1120 + 310sin20)

μ = 0.2376007... ≈ 0.238

b)

Fcosθ - μN = ma

a = (Fcosθ - μN) / m

a = (Fcosθ - μ(mg - Fsinθ) / m

a = (310cos20 - 0.2376(1120 - 310sin20) / (1120/9.81)

a = 0.441308... ≈ 0.441 m/s²