A ball travels 5 m in the positive direction, hits a wall and rebounds in the negative direction, and finally comes to rest 8 m behind its original position. If the motion of the ball takes 10 s, so its average velocity is:

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98.4 m

explanation:

let s = distance up the plane  

then by conservation of energy  

1/2m(18.3)^2 = mg s sin(10)  

(18.3)^2 = 2g s sin(10)  

s = (18.3)^2/2gsin(10)  

= 98.39564526  

= 98.4 m