They all compact like are close together
The displacement covered by the worker in the whole trip is 30km.
The easiest way to solve this problem is using the displacement equation:
Δx = x₂ - x₁
A worker covers a distance of 40 km from his house to his place of
work, and 10 km towards his house back. So:
Δx = x₂ - x₁ = 40km - 10km = 30km
It allows for more precision whilst cutting. The handles allow for more grip, and the short blades make for more accuracy. (With less danger of ricocheting) <span />
Yes, you need to convert unless the question specifically requires km/h.
In March and September both of the hemispheres receive the same amount of energy from the sun. this is because neither end of the axis is tilted toward the sun.