A person throws a ball vertically and catches it after 5.10 s. What is the ball’s initial velocity?

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.

the entire statement is true and correct.  

there's no diagram, nothing is illustrated, and no question is asked.

because if the tool that you are using is not balanced it there would be false mass.