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2024-05-13 15:02:55
a) chiều dài của lò xo là: l1= l+Δl= 40 + 5 =45 (cm)
b) l2=l +Δl=48(cm) ⇔Δl= 8(cm) = 0.08(m)
khi đó m=k.Δl÷ g = 100.0,08÷10=0,8 (kg)
2024-05-13 14:55:40
a) cùng chiều:
v= 60.4+3.90 ÷ 60+90= 3,4(m/s)
b) ngược chiều
v= -60.4+3.90÷60+90= 0,2(m/s)