20 Construct = a + b by drawing and calculating the direction and magnitude of c. The direction should be
measured from the x axis.
8.0

the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."

electric field is a function of 1/r^2

yes, the force per unit charge for a point charge is inverse square law.