I am super stuck with these problems. Could you please guide me a little bit to figure out which way to go?

Thanks for your help in advance!

Score: 0 of1 pt 2 of 6 (D complete) V 14.3.13 Consider the following position function. Find (a) the velocity and the speed of the object and (b) the acceleration of the object. r(l): (2 c0512 sinl) for05t521r (a) v(t)= . l Enter your answer in the edit elds and then click Check Answer. Score: 0 of 1 pt 3 of 6 (0 complete) 14.3.17 Consider the following position function. Find (a) the velocity and the speed of the object and (b) the acceleration of the object. r(t) = (2t + 1,2t - 4,3 + 5t) for t2 0 a. What is the velocity of the object? v(t) =( Enter your answer in the edit fields and then click Check Answer.Score: 0 of 1 pt 4 of 6 (0 complete) 14.3.31 Determine whether the following trajectory lies on a circle. If so, find the radius of the circle and show that the position vector and velocity vector are everywhere orthogonal. r(t) = (2 sint+ 213 cost,213 sint- 2 cost) for Ost= 2x Select the correct choice below and, if necessary, fill in the answer box to complete your choice. O A. The trajectory lies on a circle with radius O B. The trajectory does not lie on a circle. Click to select and enter your answer(s) and then click Check Answer. 2 parts remaining Clear AllScore: 0 of 1 pt 4 1 are (0 complete)v 14.3.9 Consider the following position function, Find la) the velocity and the speed of the object and (b) the acceleration of the object, r(t) = (216,515) for [2 o (a) v(t>=( . D Enter your answer in the edit elds and then click Check Answer. _ ___;_