Answer:
Currently in the united states using parallel system
Explanation:
because you can walk with the twomodes with internal combustion engine or running on electric power.
we know that center of mass is given as
r = (m₁ + m₂ )/(m₁ + m₂)
taking derivative both side relative to "t"
dr/dt = (m₁ d/dt + m₂ d/dt)/(m₁ + m₂)
v = (m₁ + m₂ )/(m₁ + m₂)
taking derivative again relative to "t" both side
dv/dt = (m₁ d/dt + m₂ d/dt)/(m₁ + m₂)
a= (m₁ + m₂ )/(m₁ + m₂)
The answer is Decibels. <span />
You draw a straight line from the start point to the end point. It doesn't matter what route was actually followed for the trip.