A book is lifted 3 meters in 3 seconds. The same book is lifted 3 meters yet again but in 1 second. Student Johnny says that the amount of energy required to move the book in both examples is the same because the distance does not change and the mass of the book does not change. Student Sally disagrees and states that in the second example the book is lifted faster and therefore requires more energy. Who do you agree with and why? (use the CER format for your response)

no link

explanation:

  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.

find the surface area of the sphere to the nearest square unit. use a calculator.

a. 254 in.2

b. 64 in.2

c. 127 in.2

d. 1,018 in.2

according to jean piaget, in what stage of cognitive development are children able to understand conservation task?

b. preoperational

just took it