As a stone is dropped from each floor, a stopwatch is used to measure the amount of time that elapses until it hits the ground.
(a stone; is dropped; from each floor) (a stopwatch; is used; to measure the amount of time) (a stopwatch; to measure; the amount of time) (the amount of; elapses; T:until it hits the ground) (it; hits; the ground)
a stone a stopwatch a stopwatch the amount of it
is dropped is used to measure elapses hits
from each floor
to measure the amount of time
the amount of time
T:until it hits the ground
the ground