Answer:
The parachute to open in 15 sec.
Step-by-step explanation:
Given that,
Velocity = 120 km/hr
Height = 1000 m
If his parachute must open 500. m above the ground.
We need to calculate the time for parachute to open
Using formula of time


Where, d = distance
t = time
v = velocity
Put the value into the formula


Hence, The parachute will be open in 15 sec.