The acceleration of gravity on Earth is approximately 10 m/s2 (more precisely, 9.8 m/s2). If you drop a rock from a tall building, about how fast will it be falling after 3 seconds?
A)20 m/s
B)10 m/s
C)10 m/s2
D)30 m/s
E)30 m/s2

Question

Quizplus · Accepted Answer

The velocity of the rock after 3 seconds can be found using the formula: 
v = gt 
where g is the acceleration due to gravity (10 m/s2) and t is the time (3 seconds). 
Plugging in the values, we get: 
v = 10 m/s2 x 3 s = 30 m/s 
Therefore, the rock will be falling at a speed of approximately 30 m/s after 3 seconds, so the answer is D.

The Acceleration of Gravity on Earth Is Approximately 10 M/s2