Average acceleration and instantaneous acceleration.

 

 

Question: a particle moves according to

      x = - t2 + 2 t +3,
      y = 0.5 t2 - 2.5 t +2.

Find its acceleration at t = 2 s in unit-vector notation and as a magnitude and an angle.

 

Answer:

               

                                           


Question: If the position of a particle is given by

     

with in meters and t  in seconds.  What must be the units of the coefficients 3, 5 and -2

 

Answer:

3 m/s4

5 m/s2

-2 m