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2. motion in straight line — Physics STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 SciencePhysics2. motion in straight line1 Mark
MCQ
A rocket is fired upward from the earth's surface such that it creates an acceleration of $20\, m/s^2$. If after $5\, s$ its engine is switched off, the maximum height of the rocket  from the earth's surface would be......$m$
  • A
    $250$
  • B
    $500$
  • ✓
    $750$
  • D
    $1000$
✓

Answer

Correct option: C.
$750$
c
$\mathrm{H}=\mathrm{S}_{1}+\mathrm{S}_{2}$

$=\frac{1}{2} a t^{2}+\frac{u^{2}}{2 g}$

$=\frac{1}{2} \times 20 \times 5^{2}+\frac{100^{2}}{20}$

$=250+500$

$=750$

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