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x= a + bt²
a = 20 cm
b = 4 cm /s²
Dit :
- |Δr| ? .... t = 2 s
- |v| ? .... t = 2 s
Peny :
x= a + bt²
= (20) + (4)(2)²
= 20 + 4 x 4
= 20 + 16
= 36
x= a + bt²
= (20) + (4)(5)²
= 20 + 4 x 25
= 20 + 100
= 120
maka :
|Δr| = r₂ - r₁
= 120 - 36
= 84 cm