# A rock is thrown upwards at an angle of 40° with respect to the horizontal. As the rock is rising in its trajectory, the horizontal component of its velocity A) increases. B) decreases. C) remains the same. D) is zero. E) Cannot be determined without additional information.A projectile is launched with an initial velocity of 80 m/s at an angle of 30° above the horizontal. Neglecting air resistance, what is horizontal component of the projectile’s acceleration? A) 80 m/s2 B) 40 m/s2 C) 9.8 m/s2 D) 0 m/s2 E) 4.9 m/s2.A boy kicks a football with an initial velocity of 20 m/s at an angle of 25° above the horizontal. The magnitude of the acceleration of the ball while it is in flight is A) 25 m/s2. B) 20 m/s2. C) 9.8 m/s2. D) 8.4 m/s2. E) 0 m/s2.An athlete throws a ball with a velocity of 40 m/s at an angle of 20° above the horizontal. Which of the following statements is true in this case? A) The vertical component of the velocity remains constant. B) The horizontal component of the velocity changes. C) The vertical component of the velocity changes sign after the ball attains its maximum height. D) The horizontal component of the velocity changes sign after the ball attains its maximum height. E) None of the given choices is correct.

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A rock is thrown upwards at an angle of 40° with respect to the horizontal. As the rock is rising in its trajectory, the horizontal component of its velocity
A) increases.
B) decreases.
C) remains the same.
D) is zero.
E) Cannot be determined without additional information.

A projectile is launched with an initial velocity of 80 m/s at an angle of 30° above the horizontal. Neglecting air resistance, what is horizontal component of the projectile’s acceleration?
A) 80 m/s2
B) 40 m/s2
C) 9.8 m/s2
D) 0 m/s2
E) 4.9 m/s2

A boy kicks a football with an initial velocity of 20 m/s at an angle of 25° above the horizontal. The magnitude of the acceleration of the ball while it is in flight is
A) 25 m/s2.
B) 20 m/s2.
C) 9.8 m/s2.
D) 8.4 m/s2.
E) 0 m/s2.

An athlete throws a ball with a velocity of 40 m/s at an angle of 20° above the horizontal. Which of the following statements is true in this case?
A) The vertical component of the velocity remains constant.
B) The horizontal component of the velocity changes.
C) The vertical component of the velocity changes sign after the ball attains its maximum height.
D) The horizontal component of the velocity changes sign after the ball attains its maximum height.
E) None of the given choices is correct.

A rock is thrown upwards at an angle of 40° with respect to the horizontal. As the rock is rising in its trajectory, the horizontal component of its velocity
A) increases.
B) decreases.
C) remains the same.
D) is zero.
E) Cannot be determined without additional information.

A projectile is launched with an initial velocity of 80 m/s at an angle of 30° above the horizontal. Neglecting air resistance, what is horizontal component of the projectile’s acceleration?
A) 80 m/s2
B) 40 m/s2
C) 9.8 m/s2
D) 0 m/s2
E) 4.9 m/s2

A boy kicks a football with an initial velocity of 20 m/s at an angle of 25° above the horizontal. The magnitude of the acceleration of the ball while it is in flight is
A) 25 m/s2.
B) 20 m/s2.
C) 9.8 m/s2.
D) 8.4 m/s2.
E) 0 m/s2.