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  • When a girls stand on the tower of height 2 cm above the ground and thrown a stone horizontally with a speed of 10m/s. find the speed with stone will strike the ground.  (neglect air resistanc

When a girls stand on the tower of height 2 cm above the ground and thrown a stone horizontally with a speed of 10m/s. find the speed with stone will strike the ground.  (neglect air resistance)              (g=10m/sec)

Option: 1

10\sqrt{5} m/s


Option: 2

10 \sqrt{3} m/s


Option: 3

\mathrm{10 \sqrt{7} \mathrm{~m} / \mathrm{sec}}


Option: 4

\mathrm{zero \: \: m/sec}


Answers (1)

best_answer

\mathrm{\begin{aligned} v_x & =10 \mathrm{~m} / \mathrm{sec} \\ v_y^{\prime} & =\sqrt{29 \mathrm{~h}} \\ & =\sqrt{2 \times 10 \times 20} \\ & =20 \mathrm{~m} / \mathrm{sec} \\ V & =\sqrt{v x^2+v y^2} \end{aligned}}

     \mathrm{\begin{aligned} & =20 \sqrt{(20)^2+(10)^2} \\ & =10 \sqrt{5} \mathrm{~m} / \mathrm{sec} \end{aligned}}

Posted by

Sanket Gandhi

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