A shelf stocker lifts a 7.5-kg carton from the floor to a height of 0.70 m, carries it 45 m at constant speed across the store and places it on a shelf 1.5 m above the floor. How much work does the worker do on the carton?

force is based upon mass and acceleration.the statement is not always true.

it can be explained from newton's second law of motion.

as per newton's second law of motion the rate of change of momentum is directly proportional to the applied force and takes place along the direction of force.

mathematically it can be written as -

                                              ⇒      

here   k is the proportionality constant whose value is 1.

                                                            [a is the acceleration=dv/dt]

hence we see that force not only depends on mass and acceleration but also on velocity and rate of change of mass. force f will depend on mass and acceleration only when mass is constant.

hence the statement that force is based upon mass and acceleration is false.

there are no contact forces mentioned on the list of choices that you've provided.

because if the tool that you are using is not balanced it there would be false mass.