A net force of 200N is applied to an object, causing its velocity to change from 30km/h to 20km/h in 2.3s.
What is the object's acceleration? What is its mass?
The Attempt at a Solution
I got the correct answer for acceleration (-1.2m/s^2), but I'm having trouble with finding the mass.
I'm getting 199kg (m = 200N/1.2m/s^2), but the answer key says 170g. How is that correct?