- #1
Hypnos_16
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Homework Statement
A 1056-kg van, stopped at a traffic light, is hit directly in the rear by a 705-kg car traveling with a velocity of +2.45 m/s. Assume that the transmission of the van is in neutral, the brakes are not being applied, and the collision is elastic. What is the final velocity of the car?
Van
m = 1056kg
v = 0
p = 0
Car
m = 705
v = 2.45
p = 1727.3
Homework Equations
i know that in this kind of collision problem the momentums would add
mv + mv = mv
the mass and velocities of the two vehicles would add because they would both wind up going the same way, the trouble I'm having is isolating just the speed of the car.
The Attempt at a Solution
mv + mv = mv
(1056)(0) + (705)(2.45) = (1761)v
0 + 1727.3 = 1761v
1727.3 = 1761v
v = 0.981m/s