For free fall motion the displacement can be found by graphically as well as by kinematics equation
Here acceleration of object is constant as it fall due to gravity so we can use

here if body starts with zero initial speed then we can say

here we need to find the displacement from t = 0 to t = 6s
so we can say


so the displacement will be 176.4 m
in order to find the displacement from the graph of velocity and time we need to find the area under the graph for given time interval that will also give us same displacement for given period of time.
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1. 9.04 s
We can find the time taken for the steel ball to reach the ground by using the SUVAT equation:

where
d = 400 m is the distance
u = 0 is the initial velocity of the ball
g = 9.8 m/s^2 is the acceleration of gravity
t is the time
Solving the formula for t, we find the time taken for the ball to reach the ground:

2. 88.6 m/s
The final velocity of the ball before it reaches the ground can be found by using the equation
v = u + gt
where
u is the initial velocity
g is the acceleration of gravity
t is the time
Here we have
u = 0
g = 9.8 m/s^2
Substituting the time of flight, t = 9.04 s, we find the final velocity:

Answer:
30
Explanation:
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