Here is the perfect answer to Question 9:
9. State which of the following situations are possible and give an example for each of these:
(a) An object with a constant acceleration but with zero velocity
✅ Possible
Example: A ball thrown vertically upwards at the highest point of its motion.
At the topmost point, the velocity becomes zero momentarily, but the acceleration due to gravity (approximately 9.8 m/s² downward) remains constant.
(b) An object moving with an acceleration but with uniform speed
✅ Possible
Example: An object moving in a circular path with uniform speed.
Although the speed remains constant, the direction of motion continuously changes, resulting in a change in velocity, hence the object experiences centripetal acceleration.
(c) An object moving in a certain direction with an acceleration in the perpendicular direction
✅ Possible
Example: A projectile motion (like a ball thrown horizontally).
The object moves horizontally due to its initial velocity, but it accelerates vertically downward due to gravity. Here, velocity and acceleration are perpendicular to each other.
Let me know if you'd like this in Hindi or as a neat handwritten-style note!
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