Two identical objects, each of mass 2 kg, collide elastically in one dimension. Calculate the final velocities of both objects after the collision.
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Assuming the objects are moving in opposite directions before the collision, we can use the principle of conservation of momentum to solve this problem. In an elastic collision, both momentum and kinetic energy are conserved.
Let's denote the initial velocities of the two objects as v1 and v2 (with v1 being positive and v2 being negative).
Using the principle of conservation of momentum, we have:
m1*v1 + m2*v2 = m1*v1' + m2*v2'
Since the objects are identical (m1 = m2 = 2 kg), this equation simplifies to:
2*v1 + 2*v2 = 2*v1' + 2*v2'
Simplifying further:
v1 + v2 = v1' + v2'
Now, let's consider the conservation of kinetic energy:
(1/2)*m1*v1^2 + (1/2)*m2*v2^2 = (1/2)*m1*(v1')^2 + (1/2)*m2*(v2')^2
Substituting m1 = m2 = 2 kg:
(1/2)*(2 kg)*(v1^2) + (1/2)*(2 kg)*(v2^2) = (1/2)*(2 kg)*((v1')^2) + (1/2)*(2 kg)*((v2')^2)
Simplifying further:
v1^2 + v2^2 = (v1')^2 + (v2')^2
From the above two equations, we can solve for the final velocities v1' and v2':
Solution 1:
v1' = v1
v2' = v2
Solution 2:
v1' = v2
v2' = v1
In Solution 1, the final velocities of the objects remain the same as their initial velocities. In Solution 2, the final velocities of the objects swap.
Therefore, the final velocities of both objects after the collision can be either (v1, v2) or (v2, v1), depending on the solution chosen.