The 20-lb box slides on the surface for which the box has a velocity when it is 2 ft from the plate. if it strikes the smooth plate, which has a weight of 10 lb and is held in position by an unstretched spring of stiffness determine the maximum compression imparted to the spring. take between the box and the plate. assume that the plate slides smoothly.

answer: option c. i.e. electric current flowing “downhill” from the negative electrode to the positive electrode in a battery

explanation:

the water analogy to the circuits define the pipes (water flows) to the electric current. now, we know that the electric current flows from the positive terminal to the circuit (as shown in the diagram attached).

hence, option c is the correct answer.

  distance on the y-axis and time on the x-axis.

explanation:

the instantaneous velocity = change in position/time taken

the slope of the graph should give instantaneous velocity.

  slope of a graph = change in value of y -axis / change in values of x -axis

  comparing both the equations

    change in value of y -axis = change in position

  change in values of x -axis = time taken

so position values should be on the y axis and time values should be on the x axis.

distance on the y-axis and time on the x-axis.

54 degrees incident angle = reflected angle

angle is from normal turned to line of ray