A Man Leans Over the Edge of a Cliff and Throws

Multiple Choice

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) zero.
B) 9.8 m/s.
C) 4.9 m/s.
D) 14.7 m/s.
E) none of the above.