When a rock thrown straight upwards gets to the exact top of its path, its
A) velocity is about 10 m/s and its acceleration is about 10 meters per second per second.
B) velocity is about 10 m/s and its acceleration is zero.
C) velocity is zero and its acceleration is about 10 meters per second per second.
D) velocity is zero and its acceleration is zero.
E) none of these

Question

Quizplus · Accepted Answer

At the top of its path, a rock thrown straight upwards has a velocity of 0 because it momentarily stops before starting to fall back down. However, its acceleration is about 10 meters per second per second (approximately 9.8 m/s^2) due to gravity, which continuously acts on it throughout its flight.

When a Rock Thrown Straight Upwards Gets to the Exact