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Thank you for the help. Maybe the problem set has the wrong answer

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

The collision is elastic. That is actually the second part of the question.

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...

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...