Design a method for keeping two stacks within a single linear array s[spacesize] so that neither stack overflows until all of memory is used and an entire stack i s never shifted to a different location within the array. write java methods push1, push2, pop1, and pop2 to manipulate the two stacks. (hint: the two stacks grow toward each other.)

answer; geometric center line;

answer would be

only #2 represents an object at rest on a table.

in #1, there is no normal force due to the table; the object is accelerating downward.

in #3, the vertical forces are not balanced; the object is accelerating downward.

in #4, neither the vertical nor the horizontal forces are balanced. the object is accelerating upwards and to the right.