Question

A ball is launched horizontally at 150 m/s from a cliff. What is its vertical speed after 3 seconds?

A. 150 m/s
B. 50 m/s
C. 0 m/s
D. 30 m/s

Answer 1

v_f = 30 m/s

Step-by-step explanation:

v_f = v_I + a*t

v_f = 0m/s + (9.81m/s²)*(3s)

v_f = 29.43m/s

v_f = 30 m/s

Since the object is being launched horizontally off the cliff the only vertical force acting on the ball is gravity which is an acceleration of 9.81m/s². So we have all the flowing information to use the the kinematic equation: v_f = v_I + a*t.