A rocket is fired upward from the earth's surface such that it cr… - Vidyadip

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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