Final answer:
The impact of a loaded truck on a body is very large due to the change in momentum and resultant force.
Step-by-step explanation:
When a loaded truck collides with a body, even if the truck is moving slowly, the impact on the body can be very large. This is because the force exerted by the truck on the body is determined by the change in momentum, which is the product of mass and velocity. Since trucks are typically much heavier than bodies, the change in momentum is larger, resulting in a greater force.
For example, if a loaded truck with a mass of 5000 kg collides with a body with a mass of 100 kg, even if the truck is moving at a slow speed of 10 km/hr, the force exerted on the body will be much larger compared to the force exerted by a body of the same mass colliding with another body of the same mass at the same speed.
In conclusion, the impact of a loaded truck on a body coming its way is very large because of the large change in momentum and the resultant force.