A train starts to move in a straight line with uniform acceleration at an acceleration of 0.5m/s from standstill (1) What's the speed of the train at the end of the fourth second? (2) What is the average speed in the first three seconds? (3) What is the displacement at 5S? (4) What is the displacement in the second 5S?

V0 = 0, a = 0.5m/s ^ 2 (1) V4 = at = 0.5 * 4 = 2m / S (2) V3 = at = 0.5 * 3 = 1.5m/s average velocity VM = 1.5 / 2 = 0.75m/s (3) △ X5 = x5-x4 = 1 / 2at5 ^ 2-1 / 2at4 ^ 2 = 1 / 2 * 0.5 * (5 ^ 2-4 ^ 2) = 2.25m (4) what is the displacement in the second 5S

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