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Iam getting the ans 53.3 m

When t= 0s initial velocity= 2m/s

I integrated to get v= -0.01t^2/2+2

I integrated v to get s= -0.01t^3/6 +2t+c

t=0, s=0, c=0

When it comes to rest v= 0

I get t=20s taking the velocity equation.

I substitute in s and got 53.3m

The ans in textbook is 8.43m