Final answer:
Edgar's momentum while sitting still is 0 kg m/s, because momentum is mass times velocity and his velocity is zero. In the question about an elastic collision, the final momentum of the second object is 50 kg m/s after gaining the momentum lost by the first object, due to momentum conservation.
Step-by-step explanation:
The momentum of Edgar while he is sitting still in his chair is 0 kg m/s. Momentum is the product of mass and velocity, and since Edgar is not moving, his velocity is zero. Therefore, according to the formula p = mv (where p is momentum, m is mass, and v is velocity), his momentum is also zero.
As for the elastic collision problem, we know that the total momentum before the collision is the sum of the individual momenta of the two objects. If object 1 has a momentum change from 25 kg m/s to 10 kg m/s, this means it has lost 15 kg m/s of momentum. To conserve momentum during the collision, the second object's momentum must increase by this amount. Thus, if it started with 35 kg m/s and gained 15 kg m/s, its final momentum is 50 kg m/s.