Final answer:
The force experienced by the bug is equal to the force experienced by the bus according to Newton's third law of motion. The resulting acceleration of the bug is less than the resulting acceleration of the bus if the bug has a smaller mass.
Step-by-step explanation:
In this scenario, the force experienced by the bug and the force experienced by the bus are equal to each other. According to Newton's third law of motion, when the bug crashes into the bus, the bug exerts a force on the bus and the bus exerts an equal and opposite force on the bug.
The resulting acceleration of the bug and the resulting acceleration of the bus, however, are not necessarily equal. The acceleration of an object depends on both the force acting on it and its mass. If the bug has a smaller mass than the bus, it would experience a greater acceleration compared to the bus.
Therefore, the correct answer is 'less than' when considering the force experienced by both the bug and the bus, and 'greater than' when considering the resulting acceleration of the bug and the bus.