A cyclist comes to a skidding stop in `10m`. During this process, the force on the cycle due to the road is `200N` and is directly opposite to the motion.
a. How much work does the road do on the cycle?
b. How much work does the cycle do on the road?

Options

A. `+ 200 J`
B. ` - 200 J`
C. zero
D. `- 20,000 J`

Answer

C

Explanation

Here, work is done by the frictional force on the cycle and is equal to `200 xx 10 = - 2000 J`
As the road is not moving, hence, work done by the cycle on the road = zero.