8. A baseball is hit upward and travels along a parabolic arc before it strikes the se
1 answer:
d. The x-component of the velocity of the ball is the same througout the ball's flight
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.
The other statements are wrong because:
a. The acceleration of the ball decreases as the ball moves upward. --> false because the acceleration remains the same ( downward)
b. The velocity of the ball is zero m/s when the ball is at the highest point in the arc. --> false because only the y-component of the ball's velocity is zero at the highest point, but the x-component is not zero
c. The acceleration of the ball is zero m/s when the ball is at the highest point in the arc. --> false because the acceleration remains the same ( downward)
Therefore the correct answer is
d. The x-component of the velocity of the ball is the same througout the ball's flight
Learn more about projectile motion:
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