Newton's first law of motion predicts the action of objects for which all existing forces are balanced. The first law, also referred to as the law of inertia, states that if the forces acting upon an object are balanced, the acceleration of that object will be 0 m/s/s. Objects at equilibrium will not accelerate. According to the law, an object will only accelerate if there is an unbalanced force acting upon it. The presence of an unbalanced force will change its speed, its direction, or both its speed and direction. All forces retaining to this law are related to inbalance
Answer:
<em>The block hits the ground at 27.9 m/s</em>
Explanation:
<u>Gravitational Potential Energy (GPE)</u>
It's the energy stored in an object because of its height in a gravitational field.
It can be calculated with the equation:
U=m.g.h
Where m is the mass of the object, h is the height with respect to a fixed reference, and g is the acceleration of gravity or
.
When the block is at the edge of the cliff it has potential energy that can be transformed into any other type of energy as it starts falling to the ground.
The GPE of the block of mass m=42 Kg at h=40 m is:
U = 42*9.8*40
U = 16,464 J
The block loses 81 J due to air resistance, thus the energy stored when it hits the ground is 16,464 J - 81 J = 16,383 J.
This energy is stored as kinetic energy, whose formula is:

Solving for v:



v = 27.9 m/s
The block hits the ground at 27.9 m/s
Answer:
that would be analyzing data I believe
Stars form from an accumulation of gas and dust, which collapses due to gravity and starts to form stars. The process of star formation takes around a million years from the time the initial gas cloud starts to collapse until the star is created and shines like the sun