Iron is a
1. Compound
2.an element
3.a mixture

Iron is a element

Explanation:

a substance that cannot be broken down into simpler substances by chemical means, and is characterized by its atomic number, , which represents the number of positively charged particles within that element's nucleus

compound

Explanation:

Iron is a mineral that our bodies need for many functions.

acceleration = (change in speed) / (time for the change)

change in speed = (20-120)= -100 m/s.

1.5 min = 90 sec

acceleration = -100/90 = -1.11 m/s^2.

we don't care about the 150kg or the 2,500 meters. they don't make any difference.

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the first american roller coaster was the mauch chunk switchback railway, built in the mountains of pennsylvania in the mid-1800s. the track, originally built to send coal to a railway, was reconfigured as a "scenic tour."