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sin60⁰ = N/G
1/2 * G = N
N = mg/2
N = 20N/2 = 10N
a) a = g * sinα
a = 10m/s² / √3/2 = 5√3 m/s²
c) s = at²/2 = 5√3 * 100/2 = 250√3 m