- #1
niki4d
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Homework Statement
A 82kg girl is coasting along the floor on a large 2.0kg skateboard. If she is moving 1.8 m/s when a 46kg boy jumps on to the same skateboard, what is the speed of the skateboard immediately after the boy jumps on it?
Homework Equations
Sum of Initial Momentum = Sum of Final Momentum
The Attempt at a Solution
This question looked pretty easy.. but I am sure I am doing something wrong... here's what I did so far:
(84kg)(1.8m/s) + (130kg)(0m/s) = (84kg + 130kg)Vf