A dump truck moves along a frictionless level road initially at a constant speed. A large load of gravel is suddenly poured into back of the truck. What happens to the speed of the truck? A dump truck moves along a frictionless level road initially at a constant speed. A large load of gravel is suddenly poured into back of the truck. What happens to the speed of the truck? It remains the same. It decreases. It increases. It becomes zero