# Physics

posted by .

A car going 50mi/h overtakes and passes another car moving at 45 mi/h. what length of road is required for the operation? assume that each car is 15 ft long and that there is a 60-ft space between them before and after passing. taking into account the approach of a car from the opposite direction at 50 mi/h, what clear length of road is required?

• Physics -

One car passes the other at a relative rate of 5 mph = 7.333 ft/s, and must change the distance between them by 60 + 60 + 15 = 135 feet before returning to the right side of the dividing line. The time required for the entire passing maneuver is 135/7.333 = 18.41 s. An oncoming car approaches the passing car at a relative rate 100 mph = 146.7 ft/s. The clear length of road required to avoid a collision is
146.7 x 18.41 = 2700 feet, which is over half a mile.

• Physics -

12

## Similar Questions

1. ### Physics

A truck travels at a constant speed of 28.0 m/s in the fast lane of a two-lane highway. It approaches a stationay car stopped at the side of the road. When the truck is still 1.2x10^2 m behind the car, the car pulls out into the slow …
2. ### Physics

An 893 kg car passes over a bump in a road that follows the arc of a circle of radius 14.3 meters. A) What force does the road exert on the car as the car passes the highest point of the bump if the car travels 7.53 m/s. B) What is …
3. ### physics

Just as a car starts to accelerate from rest with an acceleration of 1.4m/s2,a bus moving with a constant speed of 12m/s passes it in a parallel line. 1.How long the car overtakes the bus. 2.How fast will the car then be going. 3.How …
4. ### physics

A loaded truck is going at a speed of 36 km/hr and a car starts at point 3 km behind the truck with an acceleration of 2 m/s. when will the car overtake the car?
5. ### Physics

A car travels at 64 mi/h when the brakes are suddenly applied. Consider how the tires of a moving car come in contact with the road. When the car goes into a skid (with wheels locked up), the rubber of the tire is moving with respect …
6. ### Physics

a car and a truck start from rest at the same instant with the car initially 50m behind the truck. The truck has a constant acceleration of 2m/s^2 and the car has a constant acceleration of 3m/s^2. The car overtakes the truck after …
7. ### Math

A car is going 50mi/h after 5s. The car is traveling 30mi/h about how long does it take the car to stop
8. ### Physics

Two cars are traveling along a straight road. Car A maintains a constant speed of 79 km/h and car B maintains a constant speed of 114 km/h. At t = 0, car B is 36 km behind car A. (a) How much farther will car A travel before car B …
9. ### Physics

A drunken driver crashes his car into a parked car that has its brakes set. The two cars move off together (perfectly inelastic collision), with the locked wheels of the parked car leaving skid marks 6.0 m in length. If the mass of …
10. ### Physics

A car starts from rest with an acceleration of 1.87 m/s^2 at the same time that a second car moving with a velocity of 29.2 m/s passes it. How far does the first car move before it overtakes the second car?

More Similar Questions