Two identical hockey pucks slide frictionlessly on level ice
PHYSICS · Single correct · A Level · Physics · Mechanics and materials · Mechanics and materials
Problem
Two identical 0.25kg hockey pucks slide frictionlessly on level ice. Puck A travels east at 3.0m⋅s−1, while puck B travels north at 4.0m⋅s−1. The pucks collide at the corner of their paths and stick together. What fraction of the system’s initial kinetic energy is lost in the collision?
(a) 75\%
(b) 50\%
(c) 40\%
(d) 0\%