(3) -7 At time t = 0, an object (modelled as a particle) of mass 25 kg is at the point P = measured in metres. It is travelling with velocity -2t v(t) = 6t -1 ms -5(t+ 1)-1 (a) Find the speed of the particle at time t = 5 s. (b) Find the acceleration of the particle and the force applied to it that causes this motion as functions of t. (c) Find the position of the particle as a function of t. (1) IN

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