Magnitude in Newtons

Question

The mass of a subway car and passengers is 42,800 kg if it's acceleration as it leaves a station is 0.8 m/squared what is the net force in Newtons acting on it

Answer 1

Use Newton's second law F = ma (force equals mass times acceleration):

F = (42800)(0,8) = 34,240 N

It would be appropriate to round to 1 (or 2) sig figs.