- #1
bennyq
- 23
- 0
Homework Statement
Simple question, if a dog jumps on a stationary sled at velocity v.. the dog weighs 20kg.
The velocity after is v/2. What is the weight of the sled
Homework Equations
m1v = (m1 + m2)v/2
The Attempt at a Solution
I rearrange this equation and i get m2 = m1.. this is fine.. But what if i use kinetic energy equations, so 1/2mv^2 before should = 1/2mv^2? In this case i get a different answer , i get m2 = 3m1?