A train was moving at 50m/s and slow down to 20 m/s in 50 seconds, what was its acceleration?

-0.6 m/s^2

Explanation:

a = change in velocity / time

change in velocity = 50 m/s - 20 m/s = 30 m/s

time = 50 s

30 m/s / 50s

= 0.6 m/s^2

because it is decelarating, it will be -0.6 m/s^2

iron would move it is magnetic there is a mag field around the current in the wire

thermal energy is the answer