Answer:
Linear
speed at \[t=3s\]is \[\upsilon =2t=2\times 3=6m/s\].
Radial acc. At this instant \[{{a}_{r}}=\frac{{{\upsilon
}^{2}}}{r}=\frac{6\times 6}{0.20}=180m/{{s}^{2}}\]
Tangential acc. is \[{{a}_{t}}=\frac{d\upsilon
}{dt}=\frac{d}{dt}\left( 2t \right)=2m/{{s}^{2}}\]
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