Question

A truck loaded with sand accelerates along a highway. The driving force on the truck remains constant. What happens to the acceleration of the truck if its trailer leaks sand at a constant rate through a hole in its bottom?

Answer 1

Since the sand leaves the trailer, the mass of the truck decreases, therefore, according to Newton's law, $F = a\times m$ , where $F$ is the driving force, $a$ is the acceleration, $m$ is the mass, the acceleration will increase, since $F$ is constant and the mass decreases.