A force of 8,480 N is applied to a cart to decelerate it at a rate of 32.0 m/s^2

The mass of the cart is: 265 kg
-->Remember: Force = mass * acceleration
-->8480N = m * 32.0 m/s^2
-->[tex]\frac{8480N}{32.0m/s^2} = \frac{m*32.0m/s^2}{32.0m/s^2}[/tex]
--> 265 kg = m