It was once recorded that a plane left skid marks that were 290 m in length. Assuming that the plane skidded to a stop with a constant acceleration of -3.90 m/s2, determine the speed of the plane before it began to skid.
a = -3.90 m/s2
vf = 0 m/s
d = 290 m
(0 m/s)2 = vi2 + 2*(-3.90 m/s2)*(290 m)
0 m2/s2 = vi2 - 2262 m2/s2
2262 m2/s2 = vi2
vi = 47.6 m /s
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