When an object moves in a straight line with uniform deceleration V0 = 3m / s a = 0.4m/s ^ 2 the displacement of the object in a certain 1s s = 0.4m how long has the object been moving before this 1s?
Displacement S = v0t-0.5 * a * T ^ 2,
From △ s = 0.4 and △ t = 1, the initial velocity at the beginning of the first second is 0.6m/s,
Because: v = V0 at, v = 0.6m/s,
T = 6S can be obtained
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