Rate: |v|=ωR=2t

Tangential acceleration a 1=d|v|/dt=2

Normal acceleration: a2=|v|? /R= 4t？

So the total acceleration: a=√a 1? +a2？ =√4+ 16t^4

When a 1=a2, there is: 4t? =2 solution to t? = 1/2

So θ=t? + 1= 3/2

Unit (international unit)