Final answer:
The change in momentum of the truck when the two boxes of bananas drop off is zero.
Step-by-step explanation:
The change in momentum of the truck when the two boxes of bananas weighing 100 kg each drop off can be calculated using the principle of conservation of momentum. The momentum of an object is defined as the product of its mass and velocity. Since both boxes were initially at rest on the truck, their initial momentum is zero. When they drop off, their final momentum is still zero. Therefore, the change in momentum of the boxes is also zero.
According to the principle of conservation of momentum, the change in momentum of the boxes is equal and opposite to the change in momentum of the truck. Since the change in momentum of the boxes is zero, the change in momentum of the truck is also zero.