Answer:
The work done by the net force when the block reaches the bottom of the plane is 6 J.
Step-by-step explanation:
Given that,
Mass = 3 kg
Angle = 30°
Frictional force = 8.7 N
Length = 1 m
We need to calculate the work done
The work done is the product of net force and displacement.
Using formula of work done
....(I)
We need to calculate the net force



Put the value of net force in equation (I)


Hence, The work done by the net force when the block reaches the bottom of the plane is 6 J.