the displacement of a particle is given as 6t^2 - t^3 x(t)=6t^2-t^3 find the displace ment velocity and acceleration t=0s, 2s 4s and 6s

The bar of prob. 5/82 is repeated here. the ends of the 0.4-m bar remain in contact with their re- spective support surfaces. end b has a velocity of 0.5 m/s and an acceleration of 0.3 m/s2 in the di- rections shown. determine the angular accelera- tion of the bar and the acceleration of end a.