Although Newton's Second Law, F = Ma, Is Valid for Collisions

Multiple Choice

Although Newton's second law, F = ma, is valid for collisions, it is difficult to use it generally in this form for collisions because

A) the acceleration is too small.
B) the force F is not constant.
C) the acceleration occurs during a time interval too short to measure easily.
D) the acceleration is too small and the force F is not constant.
E) the force F is not constant and the acceleration occurs during a time interval too short to measure easily.