PLS HELP its java for AP Computer Science A Write a program that requests the user input positive numbers until they input -1, then prints the sum of all numbers. Sample run:

Enter positive numbers (-1 to stop)
3
7
8
-1
Sum is 18

answer; (a) brake pedal is depressed;

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.