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1. |
object is falling freely from a tower it travels distance =1/2 the height of the tower in its last second of journey |
Answer» <html><body><p><strong>Answer:</strong></p><p></p><p><strong>Explanation:</strong></p><p>Time of flight = </p><p>g</p><p>2H</p><p> </p><p> </p><p> </p><p> s</p><p>Distance traveled in <a href="https://interviewquestions.tuteehub.com/tag/last-3704365" style="font-weight:bold;" target="_blank" title="Click to know more about LAST">LAST</a> second =H-distance traveled in =( </p><p>g</p><p>2H</p><p> </p><p> </p><p> </p><p> −1)s</p><p>Distance <a href="https://interviewquestions.tuteehub.com/tag/traveld-3230318" style="font-weight:bold;" target="_blank" title="Click to know more about TRAVELD">TRAVELD</a> in ( </p><p>g</p><p>2H</p><p> </p><p> </p><p> </p><p> −1)s= </p><p><a href="https://interviewquestions.tuteehub.com/tag/2-283658" style="font-weight:bold;" target="_blank" title="Click to know more about 2">2</a></p><p>1</p><p> </p><p> g( </p><p>g</p><p>2H</p><p> </p><p> </p><p> </p><p> −1) </p><p>2</p><p> </p><p>= </p><p>2</p><p>g</p><p> </p><p> [ </p><p>g</p><p>2H</p><p> </p><p> +1−2 </p><p>g</p><p>2H</p><p> </p><p> </p><p> </p><p> ]</p><p>=H+ </p><p>2</p><p>g</p><p> </p><p> −g </p><p>g</p><p>2H</p><p> </p><p> </p><p> </p><p> </p><p>=H+ </p><p>2</p><p>g</p><p> </p><p> −g </p><p>2H</p><p> </p><p> g</p><p>15=H−(H+ </p><p>2</p><p>g</p><p> </p><p> − </p><p>2gH</p><p> </p><p> </p><p>= </p><p>2gH</p><p> </p><p> − </p><p>2</p><p>g</p><p> </p><p> = </p><p>2gH</p><p> </p><p> −5</p><p>2gH</p><p> </p><p> =20</p><p>2×10×H=400</p><p>H=20m</p><p></p></body></html> | |