AP EAMCET · PHYSICS · Gravitation
A body is projected vertically upwards from the surface of the earth with a velocity sufficient to carry it to infinity. The time taken by it to reach a height of three times the radius of the earth is (acceleration due to gravity \(=9.8 \mathrm{~ms}^{-2}\) and radius of the earth \(=6400 \mathrm{~km}\) )
- A 44.44 min
- B 22.22 min
- C 18.76 min
- D 37.52 min
Answer & Solution
Correct Answer
(A) 44.44 min
Step-by-step Solution
Detailed explanation
If at a distance \(r\) from the centre of the earth, the body has velocity \(v\), then by conservation of mechanical energy \((\mathrm{TE})_{\text {at weight }}=(\mathrm{TE})_{\text {at surface }}\)…
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