In an elastic collison with no net external forces acting, which of the followin

Question

In an elastic collison with no net external forces acting, which of the following are conserved?

B) velocity
C) both momentum and energy
D) both energy and velocity
E) momentum

Whenever two equal masses collide elastically in a glancing collision and one of them is initially at rest, the angle between their final velocities is always

B) 60 degrees
C) 30 degrees
D) 75 degrees
E) 90 degrees

To effectively make the calculations in two-dimensional collisions, one must

B) add the x- and y-components of the momenta together directly.
C) add each puck's momentum to its kinetic energy.
D) resolve the momenta of each puck into its x- and y-components.

Explanation / Answer

1)C) both momentum and energy 2)E) 90 degrees 3)D) resolve the momenta of each puck into its x- and y-components.

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