Atrain blows its whistle as it enters a 50 m long tunnel. what is the time delay heard by a person at the other end of the tunnel between the sound of the train's whistle through the rails and through the air? assume that the speed of sound in the air and steel are 342 m/s and 5960 m/s respectively. i probably know how to answer this but i just don't understand what the question is saying and what i'm supposed to do.

An astronaut floating in space is trying to use her jetpack to get back to her space station, but she is being pulled away by a nearby planet, as shown in the image below. her jetpack provides a constant thrust of 310 n. if she angles her jetpack in such a way that it cancels out the vertical force due to the planet's gravity, what is her net horizontal force? thaud 487 o a. 54.8 n toward the space station o b. 212.9 n toward the space station o c. 185.2 n toward the space station o d 956 n toward the space station