How fast does a truck have to be moving to catch a stuntman falling off a bridge?
February 13th, 2009 | by Michael |
John Q asked:
During the film, a stuntman must each be from a bridge into a moving truck. Assume that the stuntman has a speed initial 0 m / s and should fall 7 M. The truck? 10m away when the stuntman begins to fall and is traveling at a speed constant. How fast must the truck travel to interfere with the stuntman>?
During the film, a stuntman must each be from a bridge into a moving truck. Assume that the stuntman has a speed initial 0 m / s and should fall 7 M. The truck? 10m away when the stuntman begins to fall and is traveling at a speed constant. How fast must the truck travel to interfere with the stuntman>?
3 Responses to “How fast does a truck have to be moving to catch a stuntman falling off a bridge?”
By Matt C on Feb 13, 2009 | Reply
To find how long it would take to fall 7m you would use:
X = Xo + Vo t + 1/2 a t^2
X=0
Xo=7
Vo=0
a= -9.8
so 0 = 7 - 4.9t^2
solve for t to get 1.19 seconds
then if the truck is moving at a constant velocity it has 1.19 seconds to travel 10m
X = V * t
10 = V * 1.19
solve for V to get 8.4 m/s
By kagerendan on Feb 15, 2009 | Reply
About 11 m/s.
By des0ne on Feb 16, 2009 | Reply
seven thousand feet per sec.