13. Look at the pendulum diagram Between which points does the pendulum's potential energy increase most?

point E and A are the answers because at that point kinetic energy is zero

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.

as technology advances, new experiments often expose problems in accepted theories. c

hope i

-lavira: )