3. What is the acceleration of a 10 kg mass pushed by a 5 N force?
2 answers:
You might be interested in
Answer:
K=0.4368J
Explanation:
The mechanical energy will be the sum of the elastic energy and the kinetic energy of the block: . Their formulas are
and
for any point in the movement (although E must remain constant since the movement is frictionless), where k is the spring constant,
the displacement, m the mass of the block and v its velocity.
When the block is released from rest, at that point its mechanical energy is equal to the elastic energy, which is at its maximum () since the displacement is at its maximum (
).
Since mechanical energy is conserved, the mechanical energy at that point must be equal also to the mechanical energy at the point asked, which we will call P (when the displacement is ), so we will have:
So the kinetic energy at point P is
And substituting values we have: