What is the velocity of a plane that took 2 hours to travel 1000 miles north? A. 500 miles per hour North
B. 500 miles
C. 500 miles North
D. 500 miles per hour

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."

t = 1/400 h   ⇔ 0.0025 h ⇔ 9s ⇔ 0.15 m

any of the answers are correct.