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2009-11-02T21:22:37+01:00
S(t) = 2t*(t + 2)

a = (v(t₂) - v(t₁))/(t₂ - t₁)
v = s/t
v(t) = 2t*(t + 2)/t = 2(t + 2)
v(0) = 4

a = (v(t₂) - v(t₁))/(t₂ - t₁) = (2(t₂ + 2) - 2(t₁ + 2))/(t₂ - t₁) = (2t₂ + 4 - 2t₁ - 4)/(t₂ - t₁) = (2t₂ - 2t₁)/(t₂ - t₁) = 2(t₂ - t₁)/(t₂ - t₁) = 2
3 3 3