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Question 1:

What happens to the acceleration of an object sliding down an inclined plane when the angle of the incline decreases?

A) The acceleration increases.
B) The acceleration decreases.
C) The acceleration remains the same.
D) It depends on the mass of the object.

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Explanation: The correct answer is B) The acceleration decreases. When the angle of the incline decreases, the component of the force of gravity acting parallel to the incline decreases. This results in a decrease in the net force and, consequently, a decrease in the acceleration of the object sliding down the inclined plane.

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Question 2:

What is the path followed by a projectile launched at an angle to the horizontal?

A) Straight line.
B) Parabola.
C) Circle.
D) Ellipse.

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Explanation: The correct answer is B) Parabola. The path followed by a projectile launched at an angle to the horizontal is a curved path known as a parabola. The projectile rises, reaches a maximum height, and then descends, forming a symmetrical arc.

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Question 3:

At what point during the motion of a projectile is the vertical component of its velocity equal to zero?

A) At the highest point of its trajectory.
B) At the beginning of its motion.
C) At the end of its motion.
D) It depends on the angle of projection.

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Explanation: The correct answer is A) At the highest point of its trajectory. At the highest point of its trajectory, the vertical component of a projectile's velocity becomes zero. This is because the projectile has reached its maximum height and is momentarily motionless before it starts descending.

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Question 4:

What happens to the range of a projectile when the launch angle is increased?

A) The range increases.
B) The range decreases.
C) The range remains the same.
D) It depends on the initial velocity of the projectile.

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Explanation: The correct answer is A) The range increases. When the launch angle of a projectile is increased, the range, which is the horizontal distance traveled by the projectile, also increases. This is because a higher launch angle results in a more elongated parabolic path, allowing the projectile to cover a greater horizontal distance.

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Question 5:

What happens to the time of flight of a projectile when the launch velocity is doubled?

A) The time of flight is halved.
B) The time of flight is doubled.
C) The time of flight remains the same.
D) It depends on the angle of projection.

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Explanation: The correct answer is C) The time of flight remains the same. The time of flight of a projectile depends on the vertical component of its initial velocity and the acceleration due to gravity. Doubling the launch velocity only affects the magnitude of the initial velocity, but it does not change the acceleration due to gravity or the vertical distance covered. Therefore, the time of flight remains the same.