The rate of change of momentum of an object is equal to the … A) impulse on the object - NSC Physical Sciences - Question 1 - 2020 - Paper 1

The gravitational acceleration is given by the formula: $g = \frac{GM}{r^2}$ For planet Y, where mass is 2M and radius is ( \frac{r}{2} ), we have: $g_Y = \frac{G(2M)}{(\frac{r}{2})^2} = \frac{G(2M)}{\frac{r^2}{4}} = \frac{8GM}{r^2} = 8g$ Thus, the answer is D) ( 8g ).

In free fall, the velocity of an object continuously changes with time. Thus, the most appropriate physical quantity that can be represented on the y-axis is A) Velocity.