a) W=mg=833 N by definition
b) F=ma=76.5 N according to Newton's second law
c) a=F/m=4.12 m/s^2
d) m=F/a=720/5.5=130.91 kg
Answer: Because the hunter will try to aim at the fish, but the image of fish he sees is actually the apparent image of the fish at a location.
Heres an image to help
Hope this helps!
If the force is in the right range ... not too strong and not too
weak ... then a bathroom scale can be used to measure it.
If the force is huge, then you'd need a truck scale.
If the force is small, then you'd need a laboratory balance.
Answer
a = 3.674 m / s ^ 2
t = 3.13 s
Using the kinematic equations for the movement we have:
(1)
(2)
Where:
= initial position
= initial velocity
a = acceleration
t = time in seconds
= final speed
We know:
h = 18 m
So:
From (2) we have that: 
From (1) we have to:
Then we clear "a" to find the acceleration.
Then, the time it takes to reach this speed is:
If he's traveling at 5.2 m/s, then he covers
5.2 meters in the 1st second
5.2 meters in the 2nd second
5.2 meters in the 3rd second
5.2 meters in the 4th second
.
.
.
.
5.2 meters in the 14th second, and
5.2 meters in the 15th second.
He covers 5.2 meters 15 times in 15 seconds.
To find the total distance, you could write down 5.2 meters
15 times and add them all up. Or you could use the newly-
discovered, labor-saving process called 'multiplication' to do
the same thing. With multiplication, it can be done in one line:
(5.2 m/s) x (15 sec) = 78 meters .
