***PLEASE ANSWER LAST TWO PARTS ONLY***   MOTION OF ACCELERATING TRUCK A truck on a flat road accelerates from rest at a constant rate and covers a distance of 100 m in 5 s. The mass of the truck is 900 kg.   What is the acceleration of the truck? 8.0000 m/s2   Computer's answer now shown above. You are correct. Your receipt no. is 156-398  Previous Tries What is the net force on the truck? 7200 N   Computer's answer now shown above. You are correct. Your receipt no. is 156-8985  Previous Tries The truck is now loaded with heavy equipment and has a NEW total mass of 1300 kg. If the same net force is applied to the car as calculated above, then what would be the new acceleration of the truck? 5.5000 m/s2   Computer's answer now shown above. You are correct. Your receipt no. is 156-1541  Previous Tries With this new acceleration, how much time would it take the (heavier) truck to travel 100 m starting from rest?  s   Tries 0/3   What would be the speed of the (heavier) truck when it reaches this point?

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The horse pulls the cart and the cart pulls the horse in response as per Newton third law. So the big question is, “Don’t the two forces cancel each other? How does the cart accelerate?”