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.

Suppose a force of 60 n is required to stretch and hold a spring 0.1 m from its equilibrium position. a. assuming the spring obeys hooke's law, find the spring constant k. b. how much work is required to compress the spring 0.5 m from its equilibrium position? c. how much work is required to stretch the spring 0.6 m from its equilibrium position? d. how much additional work is required to stretch the spring 0.1 m if it has already been stretched 0.1 m from its equilibrium? a. kequals 600