From the list below, select the practice considered unsafe. (2 points) Group of answer choices

Determine your ability level by trying an advanced skill.

Do a thorough warm-up prior to starting your dance session.

Know your limitations prior to trying a new dance skill.

Use a spotter when attempting a new gymnastic skill for the first time.

Which of the following describe possible scenarios? a) an object has zero instantaneous velocity and non-zero acceleration. b) an object has negative acceleration and is speeding up. c) an object has positive acceleration and constant velocity. d) an object has positive velocity and zero acceleration. e) an object has increasing positive position and negative velocity. f) an object has decreasing positive position and negative acceleration.