1 Answer

Robert Mason · Answer 1 · 2016-03-17T07:52:55+0000

Kinetic energy = (1/2) (mass) (speed)²

25.2 J = (1/2) (5.6kg) (speed)²

Divide each side
by (2.8 kg) : 25.2 J / 2.8 kg = speed²

Take the square root
of each side: speed = √(9 m²/sec²)

= 3 m/s .

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