In a physics lab, a 0.815-kg cart (A) moving east at 20.8 cm/s collides with a 1.16-kg cart (B) that is moving west at 42.6 cm/s. After the collision, Cart A moves west at 39.2 cm/s. Assume the system is isolated. Determine the final velocity of Cart B and the momentum after collision for cart B. Use the notation that east is the positive direction and west is the negative direction.

Two rigid transformations are used to map δhjk to δlmn. the first is a translation of vertex h to vertex l. what is the second transformation? a reflection across the line containing hk a rotation about point h a reflection across the line containing hj a rotation about point k

What quantity do units represent in value

Materials will have different energies associated with the electrons inside them. this is related to how strongly bound they are by their work function. if we sandwich a material with a very low energy between two materials with a high energy, we create a trap for an electron. if this trap is very narrow in one direction in comparison to the others, this is approximately a 1-dimensional box that confines the electron. what is the lowest energy of an electron in the box if the thinnest direction across the materials is 4.81 nm?