How much work must be done to stop a 1800 kg vehicle travelling at 30m/s???

Expert Answers
thilina-g eNotes educator| Certified Educator

If we should stop the vehicle we should make its kinetic energy zero. That means we have to do a work equal to its kinetic energy against its motion.

Therefore work done  `= W`

`W = K_E`

`W = 1/2 mv^2`

`W = 1/2 xx 1800 xx 30^2 J`

`W = 900 xx 900 J`

`W = 810000 J`

`W = 810 kJ`


Therefore the work we have to in order to stop the vehicle is 810 kJ.