Lead.
Lead paint was a big problem and now lead has been removed from paint because it was found to be dangerous to the health of living organisms.
Hope this helps! :)
Answer:
<h2>6 m/s</h2>
Explanation:
The speed of the man can be found by using the formula

d is the distance
t is the time taken
From the question we have

We have the final answer as
<h3>6 m/s</h3>
Hope this helps you
Lanthanide Lanthanoid, also called Lanthanide