A person driving a car with a speed of 72 km/hr

Categories • • (31.9k) • (8.8k) • (764k) • (261k) • (257k) • (218k) • (248k) • (2.9k) • (5.2k) • (664) • (121k) • (72.1k) • (3.8k) • (19.6k) • (1.4k) • (14.2k) • (12.5k) • (9.3k) • (7.7k) • (3.9k) • (6.7k) • (63.8k) • (26.6k) • (23.7k) • (14.6k) • (25.7k) • (530) • (84) • (765) • (49.1k) • (63.8k) • (1.8k) • (59.3k) • (24.5k)

Quick navigation: • • • • • Speed, Distance & Time Calculation In order to use the above speed, distance & time calculator, or do such math on your own, you will need to know two out of three metrics: speed, distance, time. You will need to convert the metrics to the same time and distance units, e.g. miles, kilometers, meters, yards, feet, and hours, minutes or seconds. For example, if you have speed in mph (miles per hour), time should also be in hours. If you have distance in kilometers, then speed should also be in km/h (kilometers per hour). The unit of the result will depend on the units you input, but our speed calculator will conveniently display additional units where appropriate. Average Speed formula The formula for average speed, also called average velocity in physics and engineering, is: v = d / t where v is the velocity, d is the distance, and t is the time, so you can read it as Speed = Distance / Time. As noted above, make sure you convert the units appropriately first, or use our speed calculator which does that automatically. The resulting unit will depend on the units for both time and distance, so if your input was in miles and hours, the speed will be in mph. If it was in meters and seconds, it will be in m/s (meters per second). Example: If you took a plane from New York to Los Angeles and the flight was 5 hours of air time, what was the speed of the plane, given that the flight path was 2450 miles? The answer is 2450 / 5 = 490 mph (miles per hour) a...

Even if you're not a driver, you'll surely find the stopping distance calculator interesting. From the moment you spot a potentially dangerous situation to the moment when the car comes to a complete stop, it travels a certain distance. You can use this stopping distance calculator to find out how far your car travels in that time, depending on your speed, the slope of the road, and weather conditions. In this text, we will clarify the difference between the stopping distance and the braking distance. We will also explain how to calculate the stopping distance according to AASHTO (the American Association of State Highway and Transportation Officials). You might think that, as soon as you perceive the event, you hit the brake immediately, but there is always a small delay between the moment you notice the danger ahead and the instant in which you actually start to decelerate. This delay is called the reaction time. The car is still moving with the same speed. After you start braking, the car will move slower and slower towards the child until it comes to a stop. The distance traveled from the moment you first hit the brake until you come to a complete stop is called the braking distance. The stopping distance, on the other hand, is the total distance traveled since the event began - the sum of distance travelled during perception, reaction, and braking time. The AASHTO stopping distance formula is as follows: s = (0.278 × t × v) + v² / (254 × (f + G)) where: • s – Stopping...

A person driving her car at 35 km / h approaches an intersection just as the traffic light turns yellow. She knows that the yellow light lasts only 2.0 s before turning to red, and she is 28 m away from the near side of the intersection (Fig. 2–49). Should she try to stop, or should she speed up to cross the intersection before the light turns red? The intersection is 15 m wide. Her car’s maximum deceleration - 5 . 8 m / s 2 is whereas it can accelerate from 45 km / h to 65 km / h in 6.0 s. Ignore the length of her car and her reaction time. FIGURE 2 -49 Problem 73. The indications of the traffic lights are as follows . • At the green signal, the car moves in the required direction. • At the red signal, the car stops its motion. • At the yellow signal, the driver is warned that the traffic signal is going to be red. The equations of motions come to play in analyzing the car's motion near the traffic signal lights. With the help of these equations, the required results can be obtained. Case (I). The stoppage of the car. • The deceleration of the car is a = - 5 . 8 m / s 2 . • The final velocity of the car is v f = 0 m / s. • The initial velocity of the car is v i = 35 km / h 1 m / s 3 . 6 km / hr = 9 . 722 m / s. Case (II). Boosting the car’s speed through the intersection. • The first initial velocity of the car is v i = 45 km / h 1 m / s 3 . 6 km / hr = 12 . 5 m / s. • The second initial velocity of the car is v f = 65 km / h 1 m / s 3 . 6 km / hr = 18 . 055 m / s. ...