The correct answer is B. Mass = 70kg and weight = 1,000 Newtons.
How can you solve his mass and weight on Planet X?
The man's mass remains the same regardless of the planet he is on, as mass is a measure of the amount of matter in an object. Therefore, his mass on Planet X is still 70kg.
However, the man's weight will be different on Planet X because the planet has 5 times more gravity than Earth. Weight is the force of gravity acting on an object, and it is calculated using the formula:
weight = mass × gravity
On Earth, the gravity is approximately 9.8 m/s². Therefore, the man's weight on Earth is:
weight = 70 kg × 9.8 m/s² = 686 N
On Planet X, the gravity is 5 times more than Earth, so it is 5 × 9.8 m/s² = 49 m/s². Therefore, the man's weight on Planet X is:
weight = 70 kg × 49 m/s² = 3430 N
Therefore, the man's mass on Planet X is 70kg and his weight is 3430 Newtons.