its not spossed too...you may need to balance your tires
45 mph is the same as 45 mph. How can one of the two be faster?
I should have said that the car seems to sputter at those speeds rather than shake so I don't think it's a tire problem which most people tend to think of.
It is possible that the shaking in a Pontiac Montana at 45 MPH is the result of failing bearings or tie rod ends.
90seconds
neither
problem with your transmission in 5th gear
Tires and/or wheels out of balance?
Wheels are probably out of balance or you may have a bad tire.
No.
After 1 hour the slower car will be 30 mph x 1 hour = 30 miles ahead of the faster car. The faster car is travelling 45 mph - 30 mph = 15 mph faster than the slower car and so will cover this 30 miles in 30 miles ÷ 15 mph = 2 hours at which point it will have caught the slower car and start to over take it.
a = (vf - v0)/Δt 10 mph/s = (45 mph - 20 mph)/Δt Δt = 2.5 s
Kinetic Energy