a lift descending a high rise building decelerates from 30 km/he to stop in 6 seconds. the brakes on the lift exert a force of 2500N. Calculate the mass of the lift and occupants:

Acrow drops a 0.11kg clam onto a rocky beach from a height of 9.8m. what is the kinetic energy of the clam when it is 5.0m above the ground? what is its speed at that point?

Sodium chloride, nacl, is formed when a sodium atom transfers its electron to a chlorine atom. the difference in charge between the two atoms creates a(n) attraction that bonds them together.

During the past 150 years in the united states, how did energy consumption compare to population growth