Question

a stone is droped from a hightof100m.how long does it take to reach the ground
a)the first 50m
b)the second 50m

Answer 1

This looks like physics to me. If you want a physics tutor to see your post, put the subject matter in the subject box, not the name of your school. Physics is the same no matter what school you go to, it is not unique to your school.