Physics 11: Solving for Initial Speed of a Van and Compact Car Collision

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Homework Help Overview

The problem involves a collision between a van and a compact car, focusing on the conservation of momentum to determine the initial speed of the van. The scenario specifies the masses of both vehicles and their combined speed after the collision.

Discussion Character

  • Exploratory, Mathematical reasoning, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the conservation of momentum and how to set up the equation for the system before and after the collision. Questions arise regarding how to find the momentum before the collision with limited information.

Discussion Status

The discussion includes attempts to formulate the momentum equation and explore the relationship between the known final velocity and the unknown initial velocity of the van. Some participants have provided feedback on previous problems, suggesting a connection to the current question.

Contextual Notes

There is a mention of assumptions such as no friction affecting the collision, which may influence the interpretation of the problem. Participants are also navigating the constraints of the information provided.

Iceclover
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Homework Statement


a 2575-kg van runs into the back of a 825-kg compact car at rest. they move off together at 8.5m/s. assuming no friction with the ground, find the initial speed of the van
 
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Write out conservation of momentum equation. The momuentum of the system before the collision on one side and the momentum of the entire system after the collision on the other.
 
how do i do that
 
see other problem
 
how do i find out the momentum before the collision when i only have a velocity for after the collision?
 
write out the equation like in the last problem. Fortunately that is your only unknown.
 
i got 11.2 m/s
 
Good work!
 

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