Answer:
Explanation:
The gravitational potential energy of an object is defined as:
where
m is the mass of the object
g is the gravitational acceleration
h is the height of the object above a reference level (usually, the ground)
For the boulder in the problem,
m = 1000 kg
g = 10 N/kg
h = 6 m
Substituting,
The net force in the x-direction is 100 N forward
Explanation:
To answer the question, we just need to care about the forces acting along the x-direction.
Along this direction, we have:
- The pedaling force, forward, of magnitude F = 400 N
- The air resistance, acting backward, of magnitude R = 300 N
Taking forward as positive direction, this means that we can rewrite the two forces as
F = 400 N
R = -300 N
Therefore, the net force in the x-direction is
And the positive sign means its direction is forward.
Learn more about forces here:
#LearnwithBrainly