anonymous
  • anonymous
a ball rolls off a horizontal shelf a height h above the floor and takes 0.5s to hit.For the ball to take 1.0s to reach the floor the shelf's height above the floor would have to be A) 2h B)3h C) sqrt(2) h D)4h
Physics
jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
rolls off=no initial vertical component of velocity. \(S=0t+\frac{1}{2}(9.8) t^2\) \(H_1=4.9t_1^2\) when \(t_2=2t_1\)(i.e. 1s is double 0.5s) \(H_2=4.9t_2^2=4.9(2t_1)^2=4.9(4t_1^2)=4(4.9t_1^2)=4H_1\)
anonymous
  • anonymous
Thank you!
anonymous
  • anonymous
you're welcome :)

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