19. An 8.5-kg box is at rest on a flat, frictionless surface. A 170-N pulling force is briefly applied to the box, after which the box moves at a constant velocity of 8.1 m/s in the direction of the pull. For how long was the pulling force acting on the box?

0.22 s
0.82.5 s
1.05 s
0.41 s

Electric field of the earth. the earth has a net electric charge that causes a field at points near its surface equal to 150 n> c and directed in toward the center of the earth. (a) what magnitude and sign of charge would a 60-kg human have to acquire to overcome his or her weight by the force exerted by the earth’s electric field? (b) what would be the force of repulsion between two people each with the charge calculated in part (a) and separated by a distance of 100 m? is use of the earth’s electric field a feasible means of flight? why or why not?

This is one type of line graph in which the independent variable is time plotted on the x axis and the dependent variable, also numerical, is plotted on the y axis.

Often called simply "velocity," this is the velocity of an object at a particular moment in time.