Detailed derivation of Acceleration Formula by difference method in senior one physics

Let the time between the points 012345,,,,,,,, be t, the distance from each point to 0 be x1, X2, X3, x4, X5, the distance between two adjacent points be S1, S2, S3, S4,,,,, and the speed of 0 be v0. Then: X1 = v0t + at ^ 2 / 2x2 = V0 (2t) + a (2t) ^ 2 / 2x3 = V0 (3T) + a (3T) ^ 2 / 2x4 = V0 (4T) +

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1. The derivation process of physical Acceleration Formula in grade one of senior high school needs formula and derivation process urgently!
2. The physical formulas of the second half of the semester are the theorem of kinetic energy, the law of conservation of momentum and so on,
3. How to deduce the centripetal acceleration formula a = R ω ^ 2?
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