# physics

posted by
**Chris**
.

An elevator with a wieght of 27.8 kN is given an upward acceleration of 1.22 m/s^2 by a cable. a) what is the tension in the cable. b) what is the tension when the elevator is declerating at the rate of 1.22m/s^2 but is still moving upwards?

what exactly is a kN? to find the tension of part a what equation would I use? for b) I need to make a=-1.22m/s^2 but I am not sure what the equation I would use be.