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= 1/2 . 0,1 . 4² + 1/2 . 1/2 . 0,1 r² . v²/r²
= 0,8 + 1/4 . 0,1 . 16
= 0,8 + 0,4
= 1,2 joule
*mohon koreksinya
^_^
v = 4 m/s
m = 0,1 kg
Inersia Bola pejal (I) = 1/2 . m . r²
Ek = ?
Jawab:
Ek = 1/2 . I . ω² ------------> ω² = v/r
= 1/2 . 1/2 . m . r² . (v/r)²
= 1/4 . m . v²
= 1/4 . 0,1 . 4²
= 1/4 . 0,1 . 16
Ek = 0,4 J