Answer:
The speed is 
Explanation:
From the question we are told that
The angle of slant is 
The weight of the toolbox is 
The mass of the toolbox is 
The start point is
from lower edge of roof
The kinetic frictional force is 
Generally the net work done on this tool box can be mathematically represented as

The workdone due to weigh is = 
The workdone due to friction is = 
Substituting this into the equation for net workdone

Substituting values


According to work energy theorem


From the question we are told that it started from rest so u = 0 m/s

Making v the subject
Substituting value


Answer:
<em>The range is 15.15 m and the time in the air is 1.01 s</em>
Explanation:
<u>Horizontal Motion</u>
When an object is thrown horizontally (with angle 0°) with a speed v from a height h, it follows a curved path ruled exclusively by gravity until it eventually hits the ground.
The range or maximum horizontal distance traveled by the object can be calculated as follows:

To calculate the time the object takes to hit the ground, we use the equation below:

The cannon is shot from a height of h=5 m with an initial speed of v=15 m/s. The range is calculated below:

d = 15.15 m
The time in the air is:

t = 1.01 s
The range is 15.15 m and the time in the air is 1.01 s