mn, so you can make the same sort of approximation as in P1. As before, the bottom of the Bi is initially at a height h above the floor, and the h+ height of ball Bn is at height h +l above the floor. The stack is dropped, and each ball collides elastically with its neighbor (you can think of i as a chain reaction: first Bi and B2 collide, then B2 and B3, etc) B4 B3 B2 B1 Obtain an expression for the velocity of Bn after the chain of collisions. How large must n be in order for it to achieve escape velocity from earth? (Ignoring friction and other realities)” aria-describedby=”gp9″ style=”display:none;visibility:hidden;” /> mn, so you can make the same sort of approximation as in P1. As before, the bottom of the Bi is initially at a height h above the floor, and the h+ height of ball Bn is at height h +l above the floor. The stack is dropped, and each ball collides elastically with its neighbor (you can think of i as a chain reaction: first Bi and B2 collide, then B2 and B3, etc) B4 B3 B2 B1 Obtain an expression for the velocity of Bn after the chain of collisions. How large must n be in order for it to achieve escape velocity from earth? (Ignoring friction and other realities)” aria-describedby=”gp9″ />