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

Rajasthan BoardEnglish MediumSTD 11 SciencePhysics2. motion in straight line1 Mark
MCQ
A student performs an experiment to determine the acceleration due to gravity $g$. The student throws a steel ball up with initial velocity $u$ and measures the height $h$ travelled by it at different times $t$. The graph the student should plot on a graph paper to readily obtain the value of $g$ is
  • A
    $h$ versus $t$
  • B
    $h$ versus $t^2$
  • C
    $h$ versus $\sqrt{t}$
  • ✓
    $h / t$ versus $t$
✓

Answer

Correct option: D.
$h / t$ versus $t$
d
(d)

For thrown ball,

$h=u t-\frac{1}{2} g t^2 \Rightarrow \frac{h}{t}=u-\frac{1}{2} g t$

$\Rightarrow \quad \frac{h}{t}=\frac{-g}{2} \cdot t+u$

Comparing with $y=m x+c$, graph of $\frac{h}{t}$ versus $t$ is a straight line with slope $\frac{-g}{2} .$

From above graph, value of acceleration due to gravity can be obtained by multiplying its slope with $2$ .

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