4. A Frisbee is lodged in a tree branch 6.3mabove the ground. A rock thrown from below must be going at least 3.0m/sto dislodge the Frisbee.

a) How fast must such a rock be thrown upward if it leaves the thrower's hand 1.2mmabove the ground?

Express your answer using two significant figures.

5. A rock is thrown directly upward from the edge of the roof of a building that is40.5meters tall. The rock misses the building on its way down and is observed to strike the ground 4.00 seconds after being thrown. Neglect any effects of air resistance. With what speed was the rock thrown?

Answer rating: 100% (QA)

Lets begin by solving question 4 Given Initial height of the rock above the ground 12 m Final height ... View the full answer