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## Homework Statement

A car has a mass of 1350 kg and an initial speed of 21 m s-1. Calculate the magnitude of the unbalanced force applied to the brakes that caused the car to come to a halt in 3 seconds.

## Homework Equations

Force = mass x acceleration,

= ( 1350 kg ) x ( -7 m s-2 ),

= -9450 kg m s-2

= -9450 N

My question is this, is it ok to write the answer as a negative value of newtons, as above, because it doesn't seem right? I'm a little confused, any advice would be appreciated.