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7. gravitation — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics7. gravitation1 Mark
MCQ
The escape velocity of a projectile from the earth is approximately .......... $km/sec$
  • A
    $0.112$
  • B
    $112$
  • ✓
    $11.2$
  • D
    $11200$
✓

Answer

Correct option: C.
$11.2$
c
(c) Escape velocity $=\sqrt{2 g R}$

$\Rightarrow \quad V_{e}=\sqrt{2 \times 10 \times 6400 \times 1000}$

$\Rightarrow \quad V_{e}=11.2 \mathrm{Km} / \mathrm{sec}$

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