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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 body projected vertically upwards with a velocity $u$ returns to the starting point in $4 \,seconds$. If $g = 10m/sec^2$, the value of $u$ is.........$m/sec$
  • A
    $5$
  • B
    $10$
  • C
    $15$
  • ✓
    $20$
✓

Answer

Correct option: D.
$20$
d
(d)Time of flight $T = \frac{{2u}}{g} = 4\;\sec \Rightarrow u = 20\;m/s$

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