For this problem, assume that the acceleration of gravity is 10 m/s² downward, and that all friction effects can be neglected. A ball is thrown upward at a velocity of 20 m/s. What is its velocity after 3 s? A) 20 m/s upward B) zero C) 10 m/s upward D) 10 m/s downward E) 20 m/s downward

Question

Quizplus · Accepted Answer

The initial velocity is 20 m/s upward. After 3 seconds, the velocity change due to gravity is 3 s * 10 m/s² = 30 m/s downward. The final velocity is 20 m/s upward - 30 m/s downward = 10 m/s downward.

For This Problem, Assume That the Acceleration of Gravity Is