Question

What is the acceleration of a train moving west at a velocity of 15 m/s that slows to 5 m/s in 20 seconds

Answer 1

Acceleration = 0.5 m/s^2

Acceleration is the rate of change of velocity.

(15 - 5)
______ = 10/-20 = -1/2

(0 - 20)

The train is losing velocity at a rate of -1/2m/s per second.