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At time t,  r→ = 8.60t2 î - (4.90t + 6.10t2) ĵ gives the position of a...

At time t,  r→ = 8.60t2 î - (4.90t + 6.10t2) ĵ gives the position of a 3.0 kg particle relative to the origin of an xy coordinate system ( r→ is in meters and t is in seconds). (a) Find the torque acting on the particle relative to the origin at the moment 4.50 s (b) Is the magnitude of the particle’s angular momentum relative to the origin increasing, decreasing, or unchanging?

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