A ball is thrown from $10\,m$ height at speed $v_0$ vertically downward. In colliding surface of earth it looses $50\%$ of its energy and again reach upto same height. Value of $v_0$ is :- .................$\mathrm{m}/ \mathrm{s}$
A ball is thrown from $10\,m$ height at speed $v_0$ vertically downward. In colliding surface of earth it looses $50\%$ of its energy and again reach upto same height. Value of $v_0$ is :- .................$\mathrm{m}/ \mathrm{s}$
- A
$14$
- B
$9.8$
- C
$4.9$
- D
$19.6$
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