The answer is 6 Joules. The kinetic energy (KE) of an object is the product of half of the mass (m) of the object and the square of its velocity (v²): KE = 1/2mv². We know that m = 0.75 kg and that v = 4 m/s. Therefore, KE = 1/2 0.75 kg (4 m/s)² = 1/2 0.75 kg 16 m²/s² = 6 kgm²/s² = 6 J.
