You're conducting a physics experiment on another planet. You drop a rock from a height of 2.1 m and it hits the ground 0.6 seconds later. What is the acceleration due to gravity on this planet?

A. 7.0 m/s2

B. 9.8 m/s2

C. 11.7 m/s2

D. 5.2 m/s2

(What formula should I use to solve this on my own?)

The formula to use is the one that connects the acceleration,

the distance fallen, and the time spent falling:

Distance = 1/2 a T².

You said 2.1 meters in 0.6 second.

2.1 m = 1/2 a (0.6 sec) ²

Multiply each side by 2 : 4.2 m = a (0.6 sec) ²

Divide each side by (0.6 sec) ² = (4.2/0.36) m/s² = a

a = (11 and 2/3) m/s²

(about 19% more than Earth's gravity)