Vertical Motion and Free Fall Video Lessons

Concept

# Problem: 3. A man leans over the edge of a cliff and throws a rock upward at 4.9 m/s. Neglecting air resistance, two seconds later the rock's speed is A) 9.8 m/s. B) 14.7 m/s. C) 4.98 m/s. D) zero E) none of the above

###### FREE Expert Solution

3.

Using the kinematic equation:

vf = v0 - gt

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###### Problem Details

3. A man leans over the edge of a cliff and throws a rock upward at 4.9 m/s. Neglecting air resistance, two seconds later the rock's speed is

A) 9.8 m/s.

B) 14.7 m/s.

C) 4.98 m/s.

D) zero

E) none of the above

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