A horizontal force of 80 N is required to push a bookcase across a floor at a constant velocity. How much friction acts on the bookcase when it is at rest on a horizontal surface without being pushed?

u=13

v=30

s/t=u+1\2at

=13+431/2

=13+265.5

=278.5

answer

procedural programming, object-oriented programming

explanation

procedural programming is a type of computer programming language that specifies a series of well structured steps and procedures   within its development period of time. it contains a systematic order of statements, functions and commands to complete a computational task or program. it is centered on creating procedures. while object oriented programming is a programming language that is centered on creating objects rather that actions and data rather than logic.. it has four principles which are inheritance, polymorphism, abstraction and encapsulation

pythagoras' theorem

square root (-5^2+9^2)

square root (25+81)

square root (106)

angle is tan^-1(9/5)

neg x, pos y