# speed

a train approaching a crossing changes speed from 25 m/s to 10 m/s in 240 s. How can the train's acceleration be described?

1. 👍 0
2. 👎 0
3. 👁 210
1. ((10-25) m/s)/240s = -1/16 m/s^2

1. 👍 0
2. 👎 0
posted by Steve
2. it is slowing down, the acceleratin is negative with respect to the forward direction.

1. 👍 0
2. 👎 0

## Similar Questions

1. ### Physics

A person standing close to a railroad crossing hears the whistle of an approaching train. He notes that the pitch of the whistle drops as the train passes by and moves away from the crossing. The frequency of the distant

asked by Emily on December 7, 2012
2. ### Physics doppler effect

A person standing close to a railroad crossing hears the whistle of an approaching train. He notes that the pitch of the whistle drops as the train passes by and moves away from the crossing. The frequency of the approaching

asked by Joan on May 16, 2011
3. ### physics

A train moves along a straight track towards a road crossing with a speed of 85.0 km/hr. At the moment the front car of the train arrives at the crossing the conductor applies the brakes which decelerates the train at a constant

asked by Angel on September 26, 2018
4. ### Physics

A train moves along a straight track towards a road crossing with a speed of 85.0 km/hr. At the moment the front car of the train arrives at the crossing the conductor applies the brakes which decelerates the train at a constant

asked by Ange on September 26, 2018
5. ### Physics

A car is parked 23.0 m directly south of a railroad crossing. A train is approaching the crossing from the west, heading directly east at a speed of 59.0 m/s. The train sounds a short blast of its 340-Hz horn when it reaches a

asked by Faune on October 21, 2014
6. ### Physics

A train blows its horn as it approaches a crossing. A.) if the train engineer observes a frequency of 125Hz and a stationary observer at the crossing observes a frequency of 132Hz, what is the speed of the train? (The speed of

asked by Jared on March 27, 2017
7. ### physics

A train 400 m long is moving on a straight track with a speed of 80.1 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 16.9 km/h. Assuming constant acceleration,

asked by sally on February 3, 2012
8. ### physics

A train 400 m long is moving on a straight track with a speed of 80.1 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 16.9 km/h. Assuming constant acceleration,

asked by sally on February 3, 2012
9. ### Physics

A train 500 m long is moving on a straight track with a speed of 84.2 km/h. The engineer applies the brakes at a crossing, and later the last car passes the crossing with a speed of 16.4 km/h. Assuming constant acceleration,

asked by Bob on March 5, 2014
10. ### Physics

1. A train whistle has a frequency of 1000 Hz. If the train is speeding at a velocity of 60 km/h past a stationary railroad crossing attendant, what is the apparent frequency a) as the train approaches him, b) as it moves away

asked by James on November 26, 2009

More Similar Questions