# Physics Problem?

The position of a particle as a function of time is given by r =( 6.5 i^+ 2.1 j^)t2m, where t is in seconds.

I need to find what is the particle s speed at t1 = 2.9 s ?

I need to find what is the particle s speed at t1 = 2.9 s ?

Update:
The answer was 40 m/s

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