A hockey puck slides into a brick (harder version)

A hockey puck of mass m₁ = 2 kg slides at v_i = 15 m/s due East. It bumps into a stationary brick of mass m₂ = 5 kg. Afterwards, the puck slides away to the northeast with velocity v_1f = 10 m/s at θ₁ = 30 degrees, and the brick slides to the southeast at v_2f at θ₂.

Which of the following is the final velocity of the brick?

1. 2.44 m/s at 32 degrees South of East
2. 2.95 m/s at 47 degrees South of East
3. 3.23 m/s at 38 degrees South of East

Is this an elastic collision? That is, does it conserve kinetic energy?

1. yes
2. no

Copyright © Michael Richmond. This work is licensed under a Creative Commons License.