# Recent content by ClassicRock

1. ### Momentum/Kinetic Energy Problem

Thank you for the help. Maybe the problem set has the wrong answer
2. ### Momentum/Kinetic Energy Problem

In the second part of the question it states that this is an elastic collision. Maybe that's why when I use the conservation of energy my number is within .01 of the conservation of momentum answer. conservation of momentum gives me 1.29 conservation of energy gives me 1.30
3. ### Momentum/Kinetic Energy Problem

The collision is elastic. That is actually the second part of the question.
4. ### Momentum/Kinetic Energy Problem

Homework Statement A car moving with an initial speed v collides with a second stationary car that is 52.9 percent as massive. After the collision the first car moves in the same direction as before with a speed that is 31.8 percent of the original speed. Calculate the final speed of the...
5. ### Calculating work done using vectors

Homework Statement A single constant force F = (2.84i + 4.60j) N acts on a 4.12 kg particle. Calculate the work done by this force if the particle moves from the origin to the point having the vector position r = (1.52i - 2.55j) m. Homework Equations W=FD The Attempt at a...