Two balls are released from the same height on the moon. They both reach the ground at the same time. Which statement is correct about the two balls?

Question

The balls have the same weight. 

The balls have the same acceleration. 

The balls have the same mass. 

The balls have the same momentum.

I think this one is A, please explain if you got the answer.

Answer 1

The correct answer is, they have the same acceleration.

The equation to calculate the fall time is t = sqrt(2*h/a), where h is the drop height (which is the same for both), and a is the acceleration of gravity, also the same for both (on the moon it is about 1/6 of the 9.81m/s^2 we use for Earth).

Neither the mass, nor the weight force (mass x acceleration) nor momentum (mass x velocity) figure into this question.

Answer 2

Katy

It's B. Same acceleration. A, C, D are related to the masses. Ball's masses are not necessarily the same, but acceleration (due to moon's gravity - about 1.6 m/s/s) Velocities will be the same when the balls hit the ground but momentum (mv) may be different as the masses may be different.

Mike