Question

An unmanned spacecraft leaves for Venus. Which statements about the spacecraft’s journey are true? The weight of the spacecraft keeps changing. The mass of the spacecraft keeps changing. The weight of the spacecraft remains the same. The mass of the spacecraft remains the same. The gravitational pull on the spacecraft remains the same.

Answer 1

Mass always remains constant for particles travelling at a speed less than speed of light, but weight depends upon the gravitational pull on the body, since it is constant option C and D are correct.

Answer 2

The weight of the spacecraft keeps changing.  True.

The mass of the spacecraft keeps changing. False

The weight of the spacecraft remains the same. False

The mass of the spacecraft remains the same. True

The gravitational pull on the spacecraft remains the same. False


---Explanation:--
Mass of any object remains constant (unless it's travelling faster than light). 
Weight = mass x acceleration due to gravity.
Therefore, weight depends on gravitational pull.

Since, a spacecraft visits different planets, the gravitational pull changes, therefore, the weight changes.

Hope this helps.