A constructor on worker assisting in the paving of a street drives a heavy roller back and forth over the newly paved area to smooth the asphalt. The section of street being paved is 100 m long and the roller operator drives from the east end to the west end of the street and back again 20 times during the paving operation.

Question

a) what total distance did the roller cover?

b) what was the overall displacement of the roller?

Thanks!

Answer 1

20 * 200

zero again, but you know that :)

Answer 2

is it 20*100=2000 m

where did u get 200 from?

thanks!

Answer 3

100 west and 100 east