A0.5kg bird has a pe of 137.2 j. what height is its perch?

PE = mgh

137.2 = .5*9.8*h

h=137.2/(.5*9.8)

mgh

137.2=.5x10xh

137.2/5=h

~140/5=28metres approx ... tweet tweet

compass can be used day and night, cloudy or sunny

  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.