20170304090428-writing-problem-stone1.jpg




   - Try to do this exercise. If you cannot achieve it, watch the video and look at and listen to the explanation, but try first doing it without watching the video :



  > Exercise :

           A Stone is thrown from the top of a building with an initial velocity of 20m/s straight upward. The building is 50m high, and the Stone just misses the edge of the roof on its way down. Determine :

 a) The time needed for the Stone to reach its máximum height.
 b) The máximum height.
 c) The time needed for the Stone to return to the level of the thrower.
 d) The velocity of the Stone at this instant.
 e) The velocity and position of the Stone at time = 5 secons.


                                                      VIDEO WITH THE PROBLEM’S SOLUTION.





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