Answer:
Precocious puberty
Explanation:
Precocious puberty is when a child's body begins changing into that of an adult (puberty) too soon. When puberty begins before age 8 in girls and before age 9 in boys.
<u><em>reference</em></u>
<u><em>https://www.mayoclinic.org/diseases-conditions/precocious-puberty/symptoms-causes/syc-20351811</em></u>
It would be 3/8 m/s because V= (xf-xi)/(tf-ti) so (7-4)/(8-0)= 3/8