Problem: A bat moving at 15.0 m/s emits a high-frequency sound as it approaches a wall that is 25.5 m away.
Part I: Assuming that the bat continues straight toward the wall, how far away is it when it receives the echo? (Assume the air temperature in the cave to be 0oC.)
I've been having quite a bit of trouble understanding this problem, Thank You so much for your help. Thanks.