rosalina2307ovf0ro
rosalina2307ovf0ro rosalina2307ovf0ro
  • 22-10-2017
  • Physics
contestada

A ball is dropped from a window and takes two seconds to reach the ground .it starts from rest and reaches a final speed of 20m/a .what is the balls acceleration?

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AL2006
AL2006 AL2006
  • 22-10-2017
The ball can't reach the speed of 20 m/s in two seconds, unless you THROW it down from the window with a little bit of initial speed. If you just drop it, then the highest speed it can have after two seconds is 19.6 m/s .

If an object starts from rest and its speed after 2 seconds is 20 m/s, then its acceleration is 20/2 = 10 m/s^2 .

(Gravity on Earth is only 9.8 m/s^2.)
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