12. The equation of the movement of a particle that travels along a circumference is given by s(t) = 1- 3t...

12. The equation of the movement of a particle that travels along a circumference is given by s(t) = 1- 3t + 2t2 (in SI units). Calculate the velocity, tangential acceleration, normal and total of the particle when 2 seconds have elapsed, knowing that the normal acceleration is 0.2 m/s2 after 1 second. Solution: 5 m/s; 4 m/s2; 5 m/s2; 6.4 m/s2.