Easy physics questions


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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.

Nov 18th, 2017

Given:

a = -3.90 m/s2

vf = 0 m/s

d = 290 m

Find:

vi = ?? vf2 = vi2 + 2*a*d

(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


Apr 7th, 2015

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