A 1260.4 kg car is traveling at 21.5 m/s when

Question

the driver takes his foot off the gas pedal. It
takes 4 s for the car to slow down to 20 m/s.
How large is the net force slowing the car?
Answer in units of N.

Answer 1

252.08 kg/s/s

Answer 2

how did u get that answer