A train is traveling 0.8 km/min along a straight track, moving in the direction as shown in the figure below. A movie camera, 0.5 km away from the track, is focused on the train.

(a) How fast is the distance from the camera to the train changing when the train is 2 km from the camera? Round your answer to 3 decimal places.

Link to the figure: https://gyazo.com/0e12caa2272858430e0e30faf9ec7f15

Question

A train is traveling 0.8 km/min along a straight track, moving in the direction as shown in the figure below. A movie camera, 0.5 km away from the track, is focused on the train.

(a) How fast is the distance from the camera to the train changing when the train is 2 km from the camera? Round your answer to 3 decimal places.

Link to the figure: https://gyazo.com/0e12caa2272858430e0e30faf9ec7f15

anonymous · Answer

I've tried doing this problem already and have used up 4 out of my 5 attempts, so I just want an answer at this point. Mainly because I've literally gotten the same answer 3 different ways and according to one of my previous attempts, it is wrong. I am at a complete loss.

raffle_snaffle · Answer

What have you been using? This sounds like we need to use relativity.

anonymous · Answer

It is. I think I finally figured out the answer, but I got the question wrong on the assignment. I'm pretty sure the answer to this part was 46.557 km/min. What I had in the image I linked was the speed in km/sec. Pretty sure it is the right answer because I got part b correct with the 0.776 km/sec from before.

raffle_snaffle · Answer

@Oris okay, glad you figured it out.