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negative Acceleration

Q: What describes a trains acceleration if it changes speed from 25 m s to 10 m s in 240 s?

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Acceleration is the rate that speed changes.

Acceleration is the time rate of change of speed. Acceleration = speed/time.

acceleration = change in speed /time = (10-25)/240=15/240 = -1/16 The train is slowing down (decelerating) at a rate of 1/16 mile per second per second Added: Hate wasting work! Same answer in decimal. Acceleration ( looks like slow down here ) = change in velocity/change in time 10 mi/s = 25 mi/s/240 s - 0 = - 0. 0625 mi/s2 ======================long time braking

constant speed=0 acceleration Acceleration is the change in speed. If the speed doesn't change(ie constant) the acceleration is zero.

Average acceleration = Change in speed/time so Time = Change in speed/Average acceleration

Related questions

Acceleration is a direction plus a speed. If either changes then the acceleration changes.

The LAW of acceleration doesn't change anything; a physical law just describes how things work. Acceleration means change of speed. Or, to me more accurate, it means the rate of change of velocity - in other words, how fast velocity changes.

Acceleration is the rate that speed changes.

The acceleration changes if speed or direction changes

Acceleration

Acceleration is the rate at which speed changes, at least scalarly.

At a constant speed there is no acceleration. Acceleration describes a positive change in speed meaning to go faster. Deacceleration describes how fast something is slowing down. But at a constant speed of 60mph there is acceleration or deacceleration.

Acceleration?

Acceleration describes the motion of a car. Acceleration is defined as an increase in the rate or speed of something.

The rate at which speed changes, and the direction in which it changes.

No. Acceleration is change of velocity. It occurs when an object changes speed and/or direction.

-- "Speed" is the rate at which distance changes. -- "Velocity" is speed along with the direction of motion. -- "Acceleration" is the rate at which velocity changes, including the direction of the change.