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:

Explanation:
We could use conversation of energy. Total distance the stone will cover will be

the Final velocity will be

Okay, so they want to basically Increase their grip, and they are taking advantage of the force of friction
Answer:
1327 kg
Explanation:
So the net force exerted on the wagon would be the sum of forces from 2 horses subtracted by friction force

This force results in an acceleration of a = 1.3 m/s2. We can use Newton's 2nd law to calculate the mass of the wagon


Habitat fragmentation is a cost of urban development.
Option: A
Explanation:
Though from the view point or perspective of up gradation and development urban development is much needed but in cost of habitat fragmentation which feels very bitter. As habitat fragmentation leads to the loss of habitat, disruption of ecological cycle and environmental equilibrium.
Actually in the name of urban development we the human use our bread giver environment in a wrong way which causes natural disasters in long run. Animals become endangered , vulnerable and extinct with passage of time. Because they forced to enter into human settlements.