A hockey puck of mass m traveling along the x axis at 4.5 m/s hits another identical hockey puck at rest. If after the collision
1 answer:
Answer:
D) No, since kinetic energy is not conserved.
Explanation:
Since momentum is always conserved in all collision
so in Y direction we can say
Now similarly in X direction we will have
now final kinetic energy of both puck after collision is given as
initial kinetic energy of both pucks is given as
since KE is decreased here so it must be inelastic collision
D) No, since kinetic energy is not conserved.
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The elastic potential energy of a spring is given by
where k is the spring's constant and x is the displacement with respect to the relaxed position of the spring.
The work done by the spring is the negative of the potential energy difference between the final and initial condition of the spring:
In our problem, initially the spring is uncompressed, so
. Therefore, the work done by the spring when it is compressed until 
is
And this value is actually negative, because the box is responsible for the spring's compression, so the work is done by the box.
where k is the spring's constant and x is the displacement with respect to the relaxed position of the spring.
The work done by the spring is the negative of the potential energy difference between the final and initial condition of the spring:
In our problem, initially the spring is uncompressed, so
And this value is actually negative, because the box is responsible for the spring's compression, so the work is done by the box.