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question 18 (1 point) can an object with a velocity change direction when its acceleration is constant? support your answer with an example. no, this is not possible because it is always speeding up. no, this is not possible because it is always speeding up or slowing down. yes, but it never turns and comes back towards its initial direction. yes, this is possible, and a car that starts from rest, speeds up, slows down to a stop and then backs up is an example.
To determine if an object can change direction with constant acceleration, recall that acceleration is the rate of change of velocity (including direction). For example, a ball thrown upward has constant gravitational acceleration (downward). It slows down (decelerates) while moving up, stops at the peak, then speeds up (accelerates) downward—changing direction. Option C says "Yes, this is possible, and a ball that starts from rest, speeds up, slows down to a stop and then backs up is an example." Wait, no—wait, the correct reasoning is about acceleration being constant (like gravity). Wait, the options: let's re-express. The key is that acceleration is a vector; if acceleration is constant (magnitude and direction), velocity's direction can change. For example, a car moving in a circle with constant centripetal acceleration (magnitude) changes direction, but centripetal acceleration's direction changes (so that's not constant in direction). Wait, no—wait, constant acceleration (both magnitude and direction) like free fall. A ball thrown up: acceleration is constant (g downward). It moves up (velocity up), slows (acceleration opposite), stops, then moves down (velocity down)—direction changes. So the correct option is the one that says yes, with a valid example. Wait, the options:
- Option A: No, it's not possible... Wrong, as shown.
- Option B: No, it's never possible... Wrong.
- Option C: Yes, it is possible, and a ball... Wait, no—wait, a ball thrown up: starts with upward velocity, acceleration downward (constant). It slows, stops, then moves down. So direction changes. So the correct option is the one that affirms it's possible. Wait, the blue-marked option? Wait, the user's screenshot shows a blue mark on an option. Wait, the question is "Can an object with a constant acceleration change direction? Support your answer with an example."
The correct answer is the option that says "Yes, this is possible, and a ball that is thrown up is an example" (or similar). Wait, in the options, the one that says "Yes, this is possible, and a ball that starts from rest... No, wait, the option with the ball thrown up (or similar). Wait, the option that is correct is the one that says yes, with a valid example. So the correct option is the one that says "Yes, this is possible, and a ball that is thrown upward (or similar) is an example." Looking at the options, the third option (assuming C is the third) says "Yes, this is possible, and a ball that starts from rest, speeds up, slows down to a stop and then backs up is an example." Wait, no—maybe the correct option is the one that uses a ball thrown up. But among the given options, the correct one is the one that affirms it's possible, because acceleration being constant (magnitude and direction) allows velocity's direction to change (since velocity is speed and direction; acceleration is change in velocity). So the correct option is the "Yes" option with a valid example. Wait, the blue-marked option in the screenshot—wait, the user's screenshot shows a blue mark on an option. Wait, the options:
The correct answer is the option that says "Yes, this is possible, and a ball that starts from rest, speeds up, slows down to a stop and then backs up is an example." Wait, no—wait, no, that example: a ball starting from rest, speeding up, slowing to stop, then backing up—does that have constant acceleration? If acceleration is constant (e.g., a force applied in a direction, then reversed? No, that would change acceleration. Wait, maybe the example is flawed, but the key is the concept: constant acceler…
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C. Yes, this is possible, and a ball that starts from rest, speeds up, slows down to a stop and then backs up is an example.