April swims 50 m north and then turns and swims 20 m back to the soul What is her velocity if it takes her 60 seconds?
A. 1.2 m/s north
B. 0.5 m/s south
C. 1.2 m/s south
D. 0.5 m/s north

How is coal extracted from mountaintop removal mines? a. dynamite is used to create underground tunnels where miners go to extract the coal. b. dynamite is used to break apart rocks and then draglines are used to remove the broken rock and reach the coal. c. coal in mountaintops is extracted by digging strips in the landscape to reach the coal. d. placer deposits in mountain river bottoms are removed by

Which transition by an electron will release the greatest amount of energy? oa ob oc od

Which of these metals are magnetic?