A particle of mass m=2.0 kg is moving in a plane. It can be described by its position function r(t)=(4.0t³−18t²+24t)i+(3.0t⁴−8.0t³+12)j​+(6.0t²−24t−12)k where r is in m and t≥0 is in seconds. (a) What is the speed of this particle at t=1.0 s ?