A 10 kg ball moving at 13 m/s strikes a 20 kg ball at rest. After the collision the 10 kg ball is moving with a velocity of 7m/s. What is the velocity of the second ball?

70 give a real life example showing how sensory neurons work with the motor neurons

The total amount of energy contained in an object

Aprotein molecule in an electrophoresis gel has a negative charge. the exact charge depends on the ph of the solution, but 30 excess electrons is typical. what is the magnitude of the electric force on a protein with this charge in a 1600n/c electric field? write in two significant numbers, and also in newton