A cyclist comes to a skidding stop in 10 m. During this process, the force of 200N is applied on the cycle directly opposed to the motion.
How much work does the cycle on the road ?

Explanation

Work done on the cycle by the road is the work done by the stopping (frictional) force on the cycle due to the road
From Newton.s Third Law an equal and opposite force acts on the road due to the cycle. Its magnitude is 200 N . However, the road, undergoes no displacement. Thus work done by cycle on the road is zero