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.
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