Acar traveled at 24 km/hr for 30 minutes, how far did the car travel?

(30 min) · (1 hr / 60 min) = 0.5 hour

Distance = (speed) · (time)

Distance = (24 km/hr) · (0.5 hr)  = 12 km

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."

that would be because of both gravity and friction. so     c