Physics Help Urgent!!!!!!!!!!!!!!!!!!!!!!!!!!?

A

Axe

New member
A sled is pulled along a rough snow and released. It slides for 12.0 s before coming to rest and travels a distance of 0.40m. Assuming uniform acceleration:

(a) How fast was the sled travelling before it was released?
(b) How fast was the sled travelling at the halfway position in its slide?
 
I'm too lazy to solve it but wow 12 seconds in 0.4 meters. that's way too slow to be pulling a sled and way too little friction for even ice. who comes up with high school phys probs.

ok since nobodys answered

A.)
D= 1/2T(V+Vo)
0.4=6(0+Vo)
0.4/6= Vo
Vo= .067 m/s

B.)
v-vo=at
-.0667=12a
a= -.00556


V^2=Vo^2+2AD
0=Vo^2+2*-.00556*0.2
-vo^2= -.00224
Vo= .0473 m/s

who the hell comes up with these numbers
 
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