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Q. |
During the motion of a projectile fired from the earth surface, . |
A. | its kinetic energy remains constant |
B. | its momentum remains constant |
C. | vertical component of its velocity remains constant |
D. | horizontal component of its velocity remains constant |
Answer» D. horizontal component of its velocity remains constant | |
Explanation: The motion of a projectile is a two-dimensional motion—Horizontal motionand vertical motion—that take place independent of each other. The horizontal velocity of a projectile is constant (a never changing in value). The force of gravity continuously affects the vertical component, so the vertical motion is a uniformly accelerated motion. |
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