Advanced tape duct

A matter of Olympic smart .. do you? - phi phi speed boat

Vector position 1) of a particle at time t is given in equation akar3 R = 2t i + j cos 4 sin 2t. Find the speed of particles phi / 4 ..???

2) An object starts to spend the time. If the acceleration to be said in natural things like ta = 6t + 2, t and a second m / s squared. Character as an object moves to within 2 seconds from the beginning?

3) A knife with a speed of rotation angle omega = (4t grade 3 + 2t + 6 seats) rad / sec How many half-angle acceleration of T1 and T2 = O = 2 seconds!