Find how long a marble rolls down a ramp, given distance and angle

1. The problem statement, all variables and given/known data
How many seconds does it take a marble to run down a ramp with a length of 5.0 m and an angle of 6.9°?
Correct answer = 2.9 s.

2. Relevant equations
v = at
d = 1/2at2

3. The attempt at a solution
√2(5)/9.8≠2.9 s

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