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. one third its weight on earth’s surface.
b. nine times greater than its weight on earth’s surface.
c. three times greater than its weight on earth’s surface.
d. the same as its weight on earth’s surface.

no. dot product   =0 when vecs at right angles

when two balls of the different masses are dropped from equal height, they reach the ground at the same time .this is because they experience the same acceleration.

the acceleration is independent of mass.

thus when they are dropped they will always maintain the same velocity and travel the same distance (neglect air resistance of course) at the same time.