本题目来源于试卷: Space Time & Motion A.1 Kinematics，类别为 IB物理学
[单选题]
A projectile is fired at an angle amx/e05fs e 2aqb4 l,0 ;lnp arjm8+q:cl7zulwwove the horizontal on the surface of Moon. Which of the following statez0w;nml pc+al, :urj7l8ql4w ments is correct about its motion
A. The magnitude of the horizontal component of its velocity remains unchanged until it falls on the surface of the moon
B. The magnitude of the vertical component of its velocity remains unchanged until it falls on the surface of the moon
C. The magnitude of the horizontal component of its velocity decreases steadily until it falls on the surface of the moo
D. The magnitude of the vertical component of its velocity decreases steadily until it falls on the surface of the moon
参考答案: A
本题详细解析:
Explanation:The moon has no atmosphere. As there is no air drag, there's no change in the horizontal component of velocity. It does not decrease (making option C incorrect, and option A correct). The magnitude of vertical component decreases only while the projectile moves upwards. At its maximum height, the vertical component becomes zero and then starts increasing in the in the downward direction until it hits ground (making D incorrect). Option B is obviously incorrect as moon's gravitation keeps changing the vertical component.
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