A baseball has a mass of 0 point 1 4 5 kilograms and is 12 m above the ground. If it has a mechanical energy of 105 point 8 cap j , how fast is it moving?

Mechanical energy is the sum of gravitational potential energy and kinetic energy. The ball’s potential energy is mgh = 0.145 × 9.8 × 12 ≈ 17.1 J, so its kinetic energy is 105.8 − 17.1 ≈ 88.7 J. Using KE = ½mv² gives v = √(2 × 88.7 ÷ 0.145) ≈ 35 m/s, so the correct choice is 35 meters per second.

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