physics

posted by .

with an initial speed of 260km/h a train takes 1.50 x 10^3 m to stop on a level track. assuming the 'deceleration' is constant. what is the time in seconds taken for stopping?

• physics -

260,000 m/h * 1 h /3600 s = 72.2 m/s = Vinitial

average speed during deceleration = 72.2 / 2
= 36.1 m/s

goes 1500 m at 36.1 m/s

1500/36.1 = 41.5 seconds

Similar Questions

1. AP Physics

To stop a car, you require first a certain reaction time to begin braking. Then the car slows under the constant braking deceleration. Suppose that the total distance moved by your car during these two phases is 56.7 m when its initial …
2. Engineering Physics

A car and a train move together along straight, parallel paths with the same constant cruising speed v(initial). At t=0 the car driver notices a red light ahead and slows down with constant acceleration -a(initial). Just as the car …
3. physics

A car that weighs 1.5 × 10^4 N is initially moving at a speed of 43 km/h when the brakes are applied and the car is brought to a stop in 16 m. Assuming that the force that stops the car is constant, find (a) the magnitude of that …
4. physics

A luge and its rider, with a total mass of 84 kg, emerge from a downhill track onto a horizontal straight track with an initial speed of 41 m/s. Assume that they stop with a constant deceleration of 3.5 m/s2. (a) What magnitude F is …
5. SCIENCE(PHYSICS)

a train is moving on a straight track n travels at a speed of72km/hr and passes a pole in 3 seconds. find the time taken by the train to pass the bridge of length of 540 m?
6. math

The diagram below shows the speed time graph for a train travelling between two stations. The train starts from rest and accelerates uniformly for 150 seconds. It then travels at a constant speed for 300 seconds and finally decelerates …
7. physics

A train moves at a speed 72km/hr. When it approaches the station the driver brakes the train stops in 30 minutes. a) what is the value of deceleration?
8. physics

A train normally travels at a uniform speed of 74km/h on a long stretch of straight, level track. On a particular day, the train must make a 3.0min stop at a station along this track. If the train decelerates at a uniform rate of 1.3m/s2 …
9. Physics

At the train station, you notice a large horizontal spring at the end of the track where the train comes in. This is a safety device to stop the train so that it will not plow through the station if the engineer misjudges the stopping …
10. Physics

a train takes 5 minutes to cover a distance of 3 km between two stations p and q . Starting from rest at p , it accelerate at a constant rate to a speed 40 km/h and maintain this speed untill it is brought to rest at q . If train takes …

More Similar Questions