Urgent Pleaseeee help
A baseball is hit upward and travels along a parabolic arc before it strikes the
ground. Which one of the following statements is necessarily true?
Choose the correct Letter Only. Thanks in advance.
A) The acceleration of the ball decreases as the ball moves upward.
B) The velocity of the ball is zero m/s when the ball is at the highest point in
the arc.
C) The acceleration of the ball is zero m/s2 when the ball is at the highest
point in the arc.
D) The x-component of the velocity of the ball is the same throughout the
ball's flight.
E) The velocity of the ball is a maximum when the ball is at the highest point
in the arc.
A baseball is hit upward and travels along a parabolic arc before it strikes the
ground. Which one of the following statements is necessarily true?
Choose the correct Letter Only. Thanks in advance.
A) The acceleration of the ball decreases as the ball moves upward.
B) The velocity of the ball is zero m/s when the ball is at the highest point in
the arc.
C) The acceleration of the ball is zero m/s2 when the ball is at the highest
point in the arc.
D) The x-component of the velocity of the ball is the same throughout the
ball's flight.
E) The velocity of the ball is a maximum when the ball is at the highest point
in the arc.
Answers & Comments
Answer:
D. The x-component of the velocity of the ball is same through the ball's flight.
Step-by-step explanation:
The motion of the baseball is a projectile motion, which consists of two independent motions:
- A uniform motion (constant velocity) along the horizontal direction
- A uniformly accelerated motion, with constant acceleration (acceleration of gravity) in the downward direction.
From this description, we can already see that the correct statement is D: in fact, there is no force acting in the horizontal direction on the ball (if we neglect air resistance), therefore the acceleration in the x-direction is zero, therefore the x-component of the velocity is constant.
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