a = ∆V/∆t
1. ∆V = 20-0 = 20 м/с
∆t = 20 с
a = 20/20 = 1 м/с²
2. ∆V = 40-30 = 10 м/с
a = 10/20 = 0.5 м/с²
3. ∆V = 20-40 = -20 м/с
a = -20/20 = -1 м/с²
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a = ∆V/∆t
1. ∆V = 20-0 = 20 м/с
∆t = 20 с
a = 20/20 = 1 м/с²
2. ∆V = 40-30 = 10 м/с
∆t = 20 с
a = 10/20 = 0.5 м/с²
3. ∆V = 20-40 = -20 м/с
∆t = 20 с
a = -20/20 = -1 м/с²