What is true about warming up? A.
It prepares your heart, lungs, and muscles for exercise.
B.
It will make you stiff and sore.
C.
It is only important to do if you are doing cardio exercises.
D.
All of the above

The percent efficiency of a machine can never be 100% (or greater), because in the real world some energy is always converted into a. heat b. work c. input force d. output force

What are the three ways that an object can accelerate

Ahanging spring stretches by 35.0 cm when an object of mass 450 g is hung on it at rest. in this situation, we define its position as x = 0. the object is pulled down an additional 18.0 cm and released from rest to oscillate without friction. what is its position x at a moment 84.4 s later? express your answer in cm.