Underhand serve is a type of volleyball serve in which a player holds the ball with one hand and swings the other hand in an arc motion, striking under the ball with a fist to put it into play. An underhand serve is the most common serve for beginners.
Newton's first law of motion best illustrates the principle of inertia<span />
The answer is B, The speed is constant and the velocity is changing.
<h2>
<u>Required</u><u> </u><u>Answer</u><u>:</u></h2>
The body will <u>stay at rest </u>(Option D). It is because a force of magnitude 50 N is pulled towards left and another force is pulling it towards right with same magnitude 50 N. So, the direction of force is opposite and magnitude is same i.e. 50 N. So, they will cancel each other and net force is 0. Hence, there would be no acceleration.
- Option A - Showing acceleration
- Option B - Showing acceleration
- Option C - Change of direction due to Net force
Hence, these options are incorrect because they are only possible when net external force is non-zero. Staying at rest i.e. Option D means there is no motion and hence no acceleration, this shows that net force is 0
<u>━━━━━━━━━━━━━━━━━━━━</u>
Differences:
<u>Reflection</u> is described as the reverting back of light or sound waves in the same medium, when it falls on plane.
<u>Refraction</u> means the shift in direction of the radio waves, when it enters medium with different density.
Comparisons:
<u>Reflection and refraction</u> <em>both</em> change the direction of light and both <em>do not </em>absorb light. All light waves can be reflected and refracted.
Both <u>Reflection and Refraction</u> are phenomenon related with wave motion of sound, and electromagnetic waves, thus including light.