A car that is initially moving to the left with a velocity of -15 m/s is pushed by a 12 N force as it moves from 20 meters to 7 meters. How much work is done to the car by this force?

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.

beta is electron from nucleus

something from nucleus has changed, but charge must be same for cons of charge

if the person is shown to have +90n, then ans is -10n.

if the person is shown to have -90n, then ans is +10n.