Question

multiple select question
select all that apply
how do constant velocity and changing velocity differ?

if speed changes but direction does not, the object moves at constant velocity.

if either speed or direction changes, the object moves at changing velocity.

if either speed or direction changes, the object moves at constant velocity.

if the direction changes but the speed does not, the object moves at changing velocity.

if neither speed nor direction changes, the object moves at constant velocity.

Explanation:

1. Analyze the first option: Velocity is a vector (has speed and direction). If speed changes, velocity changes. So "If speed changes but direction does not, the object moves at constant velocity" is wrong.
2. Analyze the second option: Since velocity depends on speed and direction, if either changes, velocity changes. So "If either speed or direction changes, the object moves at changing velocity" is correct.
3. Analyze the third option: As explained, a change in speed or direction means changing velocity, so this is wrong.
4. Analyze the fourth option: Direction change (even with constant speed) changes velocity (vector). So "If the direction changes but the speed does not, the object moves at changing velocity" is correct.
5. Analyze the fifth option: If both speed and direction are constant, velocity is constant. So "If neither speed nor direction changes, the object moves at constant velocity" is correct.

Answer:

B. If either speed or direction changes, the object moves at changing velocity
D. If the direction changes but the speed does not, the object moves at changing velocity
E. If neither speed nor direction changes, the object moves at constant velocity