A particle which moves with curvilinear motion has coordinates in millimeters which vary with the time t in seconds according to x = 2.4t2 - 6.9t and y = 3.2t2 - t/2.2. Determine the magnitudes of the velocity v and acceleration a and the angles which these vectors make with the x-axis when t = 2.9 s. Answers: When t = 2.9 s, V = i mm/s, 0x = i a = i mm/s?, i

A particle which moves with curvilinear motion has coordinates in millimeters which vary with the time t in seconds according to x = 4.5t2 - 3.8t and y = 4.1t2 - t3/3.5. Determine the magnitudes of the velocity v and acceleration a and the angles which these vectors make with the x-axis when t = 4.2 s.

At time t = 12 s, the velocity of a particle moving in the x-y plane is v=0.08i + 2.28j m/s. By time t = 12.12 s, its velocity has become -0.08i + 2.14j m/s. Determine the magnitude day of its average acceleration during this interval and the angle 0 made by the average acceleration with the positive x-axis. The angle is measured counterclockwise from the positive x-axis. Answers: dav 0= Mi i m/s² O