A car that weighs 15,000 N is initially moving at 60km/hr when the brakes are applied. The car is brought to a stop in 30m. Assuming the force applied by the brakes is constant, determine the magnitude of the braking force.

Answer 1

Vf^2=Vi^2 + 2ad

but a= force/mass

so when you finally solve this, force will be negative: what does that mean?