A train moves uniformly in a straight line with an initial speed of 2 m / s and an acceleration of 0.5 m / S2? (2) What is the average speed in the first four seconds? (3) What is the displacement in 5S?

(1) The speed of the train at the end of 3S is v = V0 + at = 2 + 0.5 × 3m / S = 3.5m/s. (2) if the displacement in the first 4S is X4 = v0t4 + 12at42 = 2 × 4 + 12 × 0.5 × 16m = 12M, then the average speed in the first 4S is. V = x4t4 = 124 = 3m / S. (3) if the displacement in the first 5S is X5 = v0t5 + 12at52 = 2 × 5 + 12 × 0.5 × 25mm = 16.25m, then the displacement in the fifth s is x = x5-x3 = 16.25-12m = 4.25m The average velocity in the first four seconds is 3 M / S; (3) the displacement in the fifth second is 4.25 M

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