Answer: The speed of the baseball is approximately 71.4 m/s
Explanation: The formula for kinetic energy is KE = 1/2 * m * v^2, where KE is kinetic energy, m is the mass of the object, and v is its velocity/speed.
Rearranging the formula to solve for v, we get:
v = sqrt(2 * KE / m)
Substituting the given values, we get:
v = sqrt(2 * 200J / 0.28 kg)
v = sqrt(1428.57 m^2/s^2 / 0.28 kg)
v = sqrt(5102.46 m^2/s^2/kg)
v = 71.4 m/s