Answer:
It would hurt more to get hit by a tennis ball traveling at 20m/s.
Step-by-step explanation:
Tennis ball calculations:
M = 0.058 kg × 20 m/s = 1.16 kg·m/s
Baseball calculations:
M = 0.145 kg × 5 m/s = 0.725 kg·m/s
Comparing the moments of the two objects, the tennis ball has a higher moment (1.16 kg·m/s) compared to the baseball (0.725 kg·m/s). This means the tennis ball would hurt more.
I believe this is correct, sorry if it's wrong.