2010-01-31 01:01:46 +0000 #1
2010-01-31 01:09:54 +0000 #2
Of course, the sub-horizontal movement of inertia, if it does not take into account air resistance the horizontal speed is constant at
vertical direction is the force of gravity
vertical direction is the force of gravity
2010-01-31 01:50:52 +0000 #3
Floor After the forward part of inertia