An astronaut on another planet drops a 1-kg rock from rest. The astronaut notices that the rock falls 2 meters straight down in one second. On this planet, how much does the rock weigh?
A)1 N
B)4 N
C)5 N
D)10 N

Question

Quizplus · Accepted Answer

The acceleration due to gravity on this planet can be calculated using the formula $s = \frac{1}{2}gt^2$, where $s$ is the distance (2 meters), $g$ is the acceleration due to gravity, and $t$ is the time (1 second). Solving for $g$, we get $g = 4 \, \text{m/s}^2$. The weight of the rock is calculated using the formula $Weight = mass \times gravity$, which gives $Weight = 1 \, \text{kg} \times 4 \, \text{m/s}^2 = 4 \, \text{N}$.

An Astronaut on Another Planet Drops a 1-Kg Rock from Rest