Question

what will be the weight of a body on mars if it weight 55kg on earth

Answer 1

Because weight = mass x surface gravity, multiplying your weight on Earth by the numbers above will give you your weight on the surface of each planet. If you weigh 150 pounds (68 kg.) on Earth, you would weigh 351 lbs. (159 kg.) on Jupiter, 57 lbs. (26 kg.) on Mars and a mere 9 lbs. (4 kg.)

Answer 2

WEIGHT = MASS × GRAVITY
55 = MASS × 9.8
55/9.8 = MASS
5.61 Kg = MASS

MASS IS CONSTANT ANY WHERE

SO GRAVITY OF THE MARS is 3.71 m/s²

WEIGHT = MASS × GRÀVITY
WEIGHT = 5.61 × 3.71
WEIGHT = 20.8131 Kg (approximately)