
Arturo O. answered 10/20/17
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Use the kinematic relation
vf2 - vi2 = 2ad
vf = final speed = 5.00 m/s
vi = initial speed = 0
d = travel distance = 19.6 m
a = constant acceleration = ?
a = vf2/(2d) = (5.00)2/[2(19.6)] m/s2 ≅ 0.638 m/s2