Answer:
The man has at most 0.418 secs to get out of the way
Explanation:
To determine how much time at most the man has to get out of the way, we will calculate the time it will take the block to reach height 1.94m from height 14.3m.
To do this, we will first determine the time it will take the block to reach height 1.94 m from height 52.9 m and find the time it takes the block to reach height 14.3m above the ground from the same height (52.9 m), the difference is the time the man has to get out of the way.
Now, the time it will take the block to reach height 1.94 m from height 52.9 m
This means the time it will take the block to travel a height distance of 52.9m - 1.94m = 50.96m
From one of the equations of motions for free falling bodies
h = ut + 1/2(gt²)
Where h is the height
u is the initial velocity
t is the time
and g is the acceleration due to gravity (Take g = 9.8 m/s²)
From the question, the block falls from rest
∴ u = 0 m/s
h = 50.96 m
Putting these into the equation
50.96 = 0(t) + 1/2(9.8)(t²)
50.96 = 4.9t²
t² = 50.96/4.9
t² = 10.4
t = √10.4
t = 3.225 secs
This is the time it will take to reach height 1.94m (that is to reach the man)
For the time it takes the block to reach height 14.3m above the ground from height 52.9 m
That is, the time it takes the block to travel a height distance of 52.9m - 14.3m = 38.6 m
Here,
h = 38.6 m
and u = 0 m/s
Putting these into the same equation
h = ut + 1/2(gt²)
38.6 = 0(t) + 1/2(9.8)(t²)
38.6 = 4.9t²
t² = 38.6/4.9
t² = 7.878
t = √7.878
t = 2.807 secs
This is the time it takes the block to reach height 14.3 m
Now, the difference in time is 3.225secs - 2.807 secs = 0.418 secs
Hence, the man has at most 0.418 secs to get out of the way.
