Sounds like you may have a separated belt on one of the rear tires. These can sometimes be very hard to spot visually. When a belt separates, the tire turns in a snake like fashion and will make the car feel like it waddles as it goes down the road at low speed and is less noticeable at higher speeds.
10 to 20 mph
We know that the time traveled is 5 hours, since a car going 10 mph faster travels an extra 50 miles over the same amount of time.Dividing 300 miles by 5 hours, we get 60 mph. Since the car is traveling 10 mph, the car is traveling 70 mph.
10 mph
60 mph
90seconds
10 mph
a = (vf - v0)/Δt 10 mph/s = (45 mph - 20 mph)/Δt Δt = 2.5 s
One car length for every 10 mph.
One car length for every 10 mph.
divide mph by 10, and then multiply answer by 6 will give you kilometers
About 10 seconds.
The first recognizable car in 1886 reached a top speed of about 10 mph.