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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