Final answer:
The kinetic energy of a 0.10 kg tennis ball moving at 20 m/s is calculated using the formula KE = 0.5 × m × v2, resulting in 20 J.
Step-by-step explanation:
The question asks us to calculate the kinetic energy (KE) of a tennis ball. The formula for kinetic energy is KE = 0.5 × m × v2, where m is the mass of the object and v is the velocity. In the given problem, the mass (m) is 0.10 kg and the velocity (v) is 20 m/s. Plugging in these values, we get KE = 0.5 × 0.10 kg × (20 m/s)2 = 0.5 × 0.10 × 400 = 20 J. Therefore, the kinetic energy of the tennis ball is 20 J, which corresponds to answer choice a.