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A bullet moving with a speed of 200m/s can penetrate a plank 4cm thick. What should be the speed to penetrate the same plank up to 10 cm?​
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A bullet moving with a speed of 200m/s can penetrate a plank 4cm thick. What should be the speed to penetrate the same plank up to 10 cm?​

User Robev
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1 Answer

3 votes
500
4/200 —> 10/???
1/50 x 10/10 = 10/500
User Skeolan
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