- #1

- 26

- 0

## Homework Statement

A net force of 200N is applied to an object, causing its velocity to change from 30km/h to 20km/h in 2.3s.

## Homework Equations

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?