VirtualDynamics UniversitySolved UniversityPhysics ProblemsPhysics 1. Mechanics: Free FallJavier Montenegro Joo jmj@VirtualDynamics.OrgReturn to index page of Mechanics Problems Return to VirtualDynamics University home page




Free Fall  
(1)
An 85 gr stone falls freely in a place where the acceleration of gravity
is 15 m/sē, traveling a distance of 217.50 m during the final second of
its fall. Determine: (a) The height the stone falls from. (b) The
total falling time Solution. Since the stone is not shot but it simply falls, its initial velocity is zero. The acceleration of the falling stone is that of the gravity, g. Let the total falling time be t. Then the total falling time minus 1 sec will be t1.


(2)
An alien ball falls
freely from a static UFO in the air and touches Earth 6 s later.
Determine: (a) The height of the UFO when the ball falls down. (b) The
landing speed of the ball (c) The height reached by the alien ball at
bounce, if it is known that its bouncing speed is 75% of its landing
speed. Solution.

