Final answer:
The kinetic energy of a 0.8 kg baseball moving at 45.0 m/s is calculated using the formula KE = (1/2)mv^2 and is found to be 810 joules.
Step-by-step explanation:
The student is asking how to calculate the kinetic energy of a baseball that has a mass of 0.8 kg and is moving at a speed of 45.0 m/s. The kinetic energy (KE) of an object can be calculated using the equation KE = (1/2)mv2, where 'm' is mass and 'v' is velocity. Plugging in the given values:
KE = (1/2)(0.8 kg)(45.0 m/s)2 = (0.4)(2025) = 810 J (joules).
Therefore, the kinetic energy of the baseball is 810 joules.