Final answer:
Inertia is directly proportional to mass. The 50 kg body has more inertia of rest, while moving at the same speed, it also has more inertia of motion.
Explanation:
Inertia of rest: Inertia of rest is directly proportional to mass. So, the body with a mass of 50 kg has more inertia of rest than the body with a mass of 10 kg.
Inertia of motion: Inertia of motion is also directly proportional to mass. Therefore, when both bodies move at the same speed, the body with a mass of 50 kg will have more inertia of motion compared to the body with a mass of 10 kg.
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