The acceleration due to gravity on the surface of mars is about one-third the acceleration due to gravity on earth’s surface. the weight of a space probe on the surface of mars is about: a. nine times greater than its weight on earth’s surface. b. three times greater than its weight on earth’s surface. c. one-third its weight on earth’s surface. d. the same as its weight on earth’s surface.

one-third of its weight on Earth's surface

Explanation:

Weight of an object is = W = m*g

Gravity on Earth = g₁ = 9.8 m/s

Gravity on Mars = g₂ = g₁

Weight of probe on earth = w₁ = m * g₁

Weight of probe on Mars = w₂ = m * g₂ -------- ( 1 )

As g₂ = g₁/3 --------- ( 2 )

Put equation (2) in equation (1)

so

Weight of probe on Mars = w₂ = m * g₁ /3

Weight of probe on Mars =  m * g₁ = w₁

⇒Weight of probe on Mars = Weight of probe on earth

none, its a machine