If a train going 80 m/min hits the

brakes, and it takes the train 2.5

seconds to stop, what is the

train's acceleration?

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-0.53 m/s²

Explanation:

Acceleration is the change in velocity over change in time.

a = Δv / Δt

First, convert m/min to m/s.

80 m/min * (1 min / 60 s) = 1.33 m/s

a = (0 m/s - 1.33 m/s) / 2.5 s

a = - 0.53 m/s²