The reading on a spring balance with a holder and eight identical discs is 3.0N. Six discs are removed and the reading becomes 1.2N.
0
1
2
3
4
N spring
balance
holder
for discs
eight
discs
two
discs
0
1
2
3
4
N
What is the weight of one disc?
A 0.2N B 0.3N C 0.5N D 0.6N

  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