If your vehicle has an automatic transmission with overdrive, then at speeds above 45 mph, it should be in overdrive, which reduces engine RPM's to save fuel.
45 mph is the same as 45 mph. How can one of the two be faster?
90seconds
neither
No.
a = (vf - v0)/Δt 10 mph/s = (45 mph - 20 mph)/Δt Δt = 2.5 s
Overdrive keeps your engine RPMs low when you drive faster than 45 mph Its there for fuel economy If you drive without OD it doesnt hurt anything at all except your gas mileage
A car traveling at 45 mph has kinetic energy, which is the energy of motion. As the car moves, its speed and mass contribute to its kinetic energy. This energy is what enables the car to perform work and overcome resistance while in motion.
60 miles
80 mph
going 55 mph, its around 45 seconds.
At 45mph a car will travel 66 feet per second.
45 mph is 72.4205 kph