A(n) 6.7 kg object moving at 4.6 m/s eastward has a one-dimensional elastic collision with
a(n) 10 kg object moving at 6.7 m/s in the
opposite direction.
What is the total kinetic energy of the two mass system after the collision?
Answer in units of J.

Acarpenter builds an exterior house wall with a layer of wood 2.9 cm thick on the outside and a layer of styrofoam insulation 2.3 cm thick on the inside wall surface. the wood has k=0.080w/(m⋅k), and the styrofoam has k= 0.010 w/(m⋅k). the interior surface temperature is 19.0 ∘c , and the exterior surface temperature is -15.0 ∘c . a.)what is the temperature at the plane where the wood meets the styrofoam? celsius b.)what is the rate of heat flow per square meter through this wall? /m^2