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Explanation: Your text is a typical SONK-text. Try to make it understandable! "low energy impact" simply means that the mass times the velocity to the power of two is a low value. Since the velocity is high the mass must be low; thus "små". Q.E.D.
P.S. SONK stands for "Scientification Of No Knowledge".
Sven Petersson Sweden Local time: 22:14 Native speaker of: Swedish, English PRO pts in pair: 14142
37 mins peer agreement (net): +2
Explanation: "...skydd mot höghastighetspartiklar med låg genomslagskraft."
NE, + egen tolkning
Glenn Viklund Albania Local time: 22:14 Native speaker of: Swedish PRO pts in pair: 2476
Tack for hjalpen! Roligt att alla ar sa hjalpsamma.
Explanation: partiklar med liten massa och hög hastighet; energi = massa x hastighet x hastighet / 2
asptech Local time: 22:14 Native speaker of: Swedish PRO pts in pair: 1702