A 256 g cart moves on a horizontal, frictionless surface with a constant speed of 18.1 cm/s.
A 34.4 g piece of modeling clay is dropped
vertically onto the cart.
If the clay sticks to the cart, find the final
speed of the system.
Answer in units of cm/s.

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