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VSCCEGR

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The initial velocity of block A is 9m/s. Knowing that uk=.3 Determine the time for the block to reach zero velocity. When (theta)=20 deg.

Here is my work so far.

mv_1+Imp_1,2=mv_2

**Imp_1,2=Ff(t)+sin(theta)W(t)**

Ff=Cos(theta)uk(mg)

W=mg

Imp=9.81cos(20).3m+9.81sin(20)m

Imp=6.12mt

9m+6.12mt=0

t=1.47s

Ff=Cos(theta)uk(mg)

W=mg

Imp=9.81cos(20).3m+9.81sin(20)m

Imp=6.12mt

9m+6.12mt=0

t=1.47s

This answer is Wrong It Should Be .963s

What Have I Missed?