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STD 11 - 2. motion in straight line — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 11 - 2. motion in straight line4 Marks
MCQ
A man throws a ball vertically upward and it rises through $20 \;m$ and returns to his hands. What was the initial velocity $(u)$ of the ball and for how much time $(T)$ it remained in the air $[g = 10\,m/{s^2}]$
  • A
    $u = 10\, m/s, T = 2s$
  • B
    $u = 10\, m/s, T = 4s$
  • C
    $u = 20 \,m/s, T = 2s$
  • ✓
    $u = 20 \,m/s, T = 4s$
✓

Answer

Correct option: D.
$u = 20 \,m/s, T = 4s$
d
(d) $u = \sqrt {2gh} = \sqrt {2 \times 10 \times 20} = 20\;m/s$

and $T = \frac{{2u}}{g} = \frac{{2 \times 20}}{{10}} = 4\,sec$

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