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 

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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