A disc of 8.0 cm in radius rotates at a constant rate of 1200 revolution per minute about its central axis. Calculate the
(a) angular velocity in rad s?

(b) tangential speed at a point 3.0 cm from its centre.

(c) distance travelled by a point at the edge of the disc in 2.0 s.

(d) angular acceleration if the disc stop rotating at 3.0 s.

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  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.