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Homework Statement
A sled starts from rest at the top of a hill and slides down without constant acceleration. At same later time, it is 80 ft. from the top ; 2s after that it is 125 ft. from the top ; another 2s it is 180ft from the top.
a.) What is the acceleration of the sled?
b.) how long did it take to go from the top to the 80ft point?
The attempt at a solution
II solved for the a of the 2nd point
125ft=a(2s+4s)^2/2
125ft = a(6s)^2/2
125ft = a36s^2/2
125ft = a18s^2/2
125ft= a9s^2
13.8889ft/s^2 = a