Answer:
Step-by-step explanation:
Given
Rock is dropped from a height of

Rock is drooped so initial velocity is zero i.e.

Time taken to fall
is given by

where
y=displacement
u=initial velocity
a=acceleration
t=time



Now time taken to fall another 82 m
We can calculate this time by first calculating time taken to cover 82+82 m and then subtracting the time taken to cover 82 m


time taken
