how fast is it moving?
919917
You can draw the figure, labeling the shadow s and the distance between the man and the pole as d.\n\nThen by similar triangles, 18/(d+s) = 6/s\n\nCross multiply: 6d + 6s = 18s\n\n6d = 12s\nd = 2s\n\nYou can get dd/ds, it's 2\nYou are given dd/dt, it is 4\nYou need ds/dt.\n\ndd/ds x ds/dt = dd/dt\n\nSolve for ds/dt, add it to dd/dt and you get the rate of the increase of the tip of the shadow.
289350
At the average walking speed of 4mph it would take a minute and a half
482492
So long as there is rate of change of motion
382187
1.022 km/s so 3679.2km/h
671105
almost exactly, assuming someone on earth is doing the measurement. someone moving very fast would get a different result.
1091484
speed makes the difference.
10186
Depends on the media in which it propagates. The temperature and the pressure also slightly affect the speed. In air it's about 330 m/s.
516568
when you travel faster than the speed of sound.
683205
About 1000 feet per sec.
443688
Pretty fast...i would say around 40...
65812
It is currently 763 mph (or mach 1.02)
231616
in a flat stable position it is broadly 120 miles per hour (takes about 10 seconds to get to that).  Head down (max track) you are nearer 200 mph =8-)
685470
the speed = distance/time
302444
sound-330m/s in air medium\nlight-299,297km/s
1003796
I have no idea but probably like 70 maybe 85mph.
602547
I assume you mean "as viewed by a stationary observer outside the train" - in which case, it will fall straight to the ground, a distance of maybe 1.5 meters.\n\nAnd dude, 1000 mph? That is one helluva fast train.
440517
Ok ok...restate the question.  I'm a little slow right now.  What are you asking?