Answer:
I think 1 it might be 4 but not any other one. hope this helps!!!!
I'm not exactly sure about what you mean with the question but the Apollo 1 crew did have a fire accident during a preflight test in 1967.
Answer:To have a constant velocity, an object must have a constant speed in a constant direction.
Constant direction constrains the object to motion to a straight path. Newton's second law (F=ma ) suggests that when a force is applied to an object, the object would experience acceleration.