Physics
posted by James .
A sled that has a mass of 8.8kg moves horizontally at 20 km/h. When it passes under a bridge 13kg of snow drops ontothe sled. What is its subsequent speed?
Isn't this in inellastic collision equation. I used (m1v1)+(m2v2)=(m1+m2)(vf)
m1=8.8kg
v1=20km/h
m2=21.8kg
v2=0km/h
I got 5.75 km/h where did i go wrong?

Physics 
drwls
You went wrong doing the math. The equation you wrote is correct. m2 = 13, not 21.8.
(8.8)(20) = 21.8 Vf
Vf = 8.1 m/s
Respond to this Question
Similar Questions

Physics
A sledthat has a mass of 8.8kg moves horizontally at 20 km/h. When it passes under a bridge 13kg of snow drops ontothe sled. What is its subsequent speed? 
Physics
A sled that has a mass of 8.8kg moves horizontally at 20 km/h. When it passes under a bridge 13kg of snow drops ontothe sled. What is its subsequent speed? 
Physics
A horse draws a sled horizontally across a snowcovered field. The coefficient of friction between the sled and the snow is 0.195, and the mass of the sled, including the load, is 209.8 kg. If the horse moves the sled at a constant … 
physics
A father pushes horizontally on his daughter's sled to move it up a snowy incline, as illustrated in the figure, with h = 3.4 m and θ = 14°. The total mass of the sled and the girl is 35 kg and the coefficient of kinetic friction … 
Physics
A father pushes horizontally on his daughter's sled to move it up a snowy incline, as illustrated in the figure, with h = 3.9 m and θ = 11°. The total mass of the sled and the girl is 35 kg and the coefficient of kinetic friction … 
Physics
A horse draws a sled horizontally across a snowcovered field. The coefficient of friction between the sled and the snow is 0.195, and the mass of the sled, including the load, is 202.4 kg. If the horse moves the sled at a constant … 
Physics
A horse draws a sled horizontally across a snowcovered field. The coefficient of friction between the sled and the snow is 0.195, and the mass of the sled, including the load, is 202.4 kg. If the horse moves the sled at a constant … 
physics
A 60.0 kg person, running horizontally with a velocity of 3.80 m/s, jumps onto a 12.0 kg sled that is initially at rest. a) Ignoring the effects of friction during the collision, find the velocity of the sled and person as they move … 
Physics
A horse draws a sled horizontally on snow at constant speed. The horse can produce a power of 1.095 hp. The coefficient of friction between the sled and the snow is 0.115, and the mass of the sled, including the load, is 187.6 kg. … 
Physics
In a twist of tradition, you pull a sled horizontally with a force of 3.3 N on a frictionless surface of snow while your dog is sitting inside the sled. If the sled accelerates at 1.27 m/s 2, and the sled’s mass is 2.8 kg, what is …