A bullet travelling horizontally loses 1/20th of its velocity
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The question seems incomplete.
But here is a solution of such sort of question ➡️
⛦Hҽɾҽ ɿʂ ү๏υɾ Aɳʂฬҽɾ⚑
▬▬▬▬▬▬▬▬▬▬▬▬☟
➧ No. of planks
➾ n² / 2n - 1
➧ Where n is loss in velocity.
➧ There your answer will not consume time as time is marks in such exam,
➾ 20² / 2 × 20 - 1
➾ 10.25
➾ 11 planks ...✔
#Hope it helps ✌
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