See the distance
Classical Mechanics
Level
2
Two ships A and B are 10 km apart on a line running south to north. Ship A is streaming west at 20 km/hr and ship B is streaming north at 20 km/hr. What is there distance of closest approach and how long do they take to reach it?
7.07km,15 min
6km, 30 min
5km, 15 min
10km, 0min
None of the above
This section requires Javascript.
You are seeing this because something didn't load right. We suggest you, (a) try
refreshing the page, (b) enabling javascript if it is disabled on your browser and,
finally, (c)
loading the
non-javascript version of this page
. We're sorry about the hassle.
1 solution
See the answer can be found simply. I am not giving full answer for some thrill. But these are some needed hints: assume a body to be at rest and find the relative velocity of second one with respect to it . The relative direction of velocity of A with respect to B comes out to be North-east . Now form a line along this direction passing through A and find the minimum distance (perpendicular)between this line and B. If minimum distance(7.07) is found we can easily find time to be 15 min.