Answers: B) distance=10km
A) displacement=0km
Distance is a scalar of total unit distance travelled not depending upon path taken.
Displacement is a vector of unit displacement travelled along according to the path taken. So if we go 5km north and then go another 5km south to return home we have not had any displacement as we ended back at our starting point.
Hope this helps you understand some. Any questions feel free to ask. Thank you.
