Amotorcycle and rider have a total mass equal to 300kg. the rider applies the brakes, causing the motorcycle to accelerate at a rate of -5 m/s. what is the net force on the motorcycle?

Net force = (mass) x (acceleration)

               =  (300 kg) x (-5 m/s²)

               =  - 1,500 kg-m/s²

               =     1,500 newtons in the direction
                                opposite to the cycle's motion.    

Ithink your answer is d