Question 6 (FRQ)

6. A particle is moving along the x-axis.  Its position is modeled by the function x(t)=cos(t²+1).

              

              (a)    Find the particle’s velocity at                      time t=10.

              
              (b)   Find the particle’s acceleration at time t=10.

               
              (c)    Is the particle speeding up or slowing down at time t=10? Justify your answer.