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At the moment t=0 a particle leaves the ...

At the moment `t=0` a particle leaves the origin and moves in the positive direction of the x-axis. Its velocity varies with time as `v=v_0(1-t//tau)`, where `v_0` is the initial velocity vector whose modulus equals `v_0=10.0cm//s`, `tau=5.0s`. Find:
(a) the x coordinate of the particle at the moments of time `6.0`, `10`, and `20s`,
(b) the moments of time when the particles is at the distance `10.0cm` from the origion,
(c) the distance s covered by the particle during the first `4.0` and `8.0s`, draw the approximate plot `s(t)`.

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