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Question
If the velocity of the bullet of a rifle is doubled then how many times will be its kinetic energy?
2 times
3times
4times
16 times
ANSWER : 3
Descrption
<p style="margin-left:0px;">The kinetic energy of the bullet will be <strong>4 times</strong> greater if its velocity is doubled.</p><p style="margin-left:0px;">Here's why:</p><p style="margin-left:0px;">The kinetic energy (KE) of an object is given by the formula:</p><p>KE = 1/2 * m * v^2 </p><p style="margin-left:0px;">where:</p><ul><li>m is the mass of the object</li><li>v is the velocity of the object</li></ul><p style="margin-left:0px;">If the velocity is doubled, while the mass remains the same, the new kinetic energy will be:</p><p>New KE = 1/2 * m * (2v)^2 </p><p style="margin-left:0px;">Expanding the square:</p><p>New KE = 1/2 * m * 4v^2 </p><p style="margin-left:0px;">Comparing this to the original KE:</p><p>New KE = 4 * (1/2 * m * v^2) </p><p style="margin-left:0px;">Therefore, the new kinetic energy is <strong>4 times</strong> the original kinetic energy.</p><p style="margin-left:0px;">So, option <strong>4 times</strong> is the correct answer.</p>
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