[单选题]
A brick is moving at a speed of 3 m/s and a pebble is mov bcabv3lb8la+dk8+:d+mjgq 7 ing at a speerivhx4 k39 skr8bz4tjq/1bv )d of 5 m/s. If both objects have the same kinetic energy, what is the ratio of the briz3rb9 kbxt48sh vr qjv 4/k)1ick's mass to the rock's mass?
