Ada orang yang tidak dapat bicara ingin membeli sikat gigi ia menunjukkan pada kasir cara menggosok gigi dan si kasir mengerti. Bagaimana jika seorang yang buta ingin membeli sikat gigi?
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Explanation:
a particle is in mechanical equilibrium if the net force on that particle is zero. By extension, a physical system made up of many parts is in mechanical equilibrium if the net force on each of its individual parts is zero
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