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Verified answer
Ek = ΔEpEk = mgh1 - mgh2
Ek = mg(h1-h2)
Ek = 4 × 10 × (15-6)
Ek = 40 × 9
Ek = 360 J (B)
Verified answer
Ek = ΔEp= mg (h2 - h1)
= 4 kg . 10 m/s² . (15 m - 6 m)
= 40 kg m/s² . 9 m
= 360 J [ B ]
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