How does this app work

You ask questions and people will answer them for the points you've laid out for them. Brainliest is picking the right answer or one you just favor more. Watch out for random links they'll hac k into your firewall and then control your device they can also steal you IP address! Hope this helped you understand a little bit about this app.  :)

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.