throughout the Batman movies Batman uses his cape as a way to glide from one building or another or from the top of a building to the ground.  Could this really be possible though?  Can Batman actually glide from the top of a building to the ground without being injured on the landing?  Basic physics will tell you that he cannot glide from the top of a building to the ground without a parachute to slow himself down.  There are a few equations you can use to easily figure out the velocity he would be traveling when he reaches the ground.

First you start with the lift and drag equations.

L=1/2C_LpAv²    Where C_L is the coefficient for lift.
D=1/2C_DpAv²    Where C_D is the coefficient for drag.

    Using these two equations you can easily solve for the acceleration of Batman(A).  Batman would be traveling at approximately 100km/hr.  So upon landing at that speed unless he has a parachute to slow him down he would be severely injured or die.