Wednesday

August 27, 2014

August 27, 2014

Posted by **kelsey** on Wednesday, October 8, 2008 at 12:42am.

(a) Assuming that air resistance can be ignored, find the initial speed of the rock.

(b) Find the greatest height of the rock as measured from the base of the cliff.

- physics..help PLEASE! -
**drwls**, Wednesday, October 8, 2008 at 1:52am(a) When air resistance can be ignored, the sum of potential and kinetic energy is constant. That means tht V^2/2 + g h is constant, where h is the height measured from any reference plane. (The mass M cancels out). Use that fact to solve for the initial velocity Vo.

28^2/2 = Vo^2/2 + g*35

(b) At the greatest height, V = 0. use the same approach to solve for Hmax

**Related Questions**

physics - c) A 0.26-kg rock is thrown vertically upward from the top of a cliff ...

physics - A 0.26 kg rock is thrown vertically upward from the top of a cliff ...

PHYSICS - A 0.26kg- rock is thrown vertically upward from the top of a cliff ...

Physics - A 0.26 kg rock is thrown vertically upward from the top of a cliff ...

physics - A rock is thrown vertically upward from the edge of a cliff. The rock ...

physics - A rock is thrown vertically upward from the edge of a cliff. The rock ...

Physics - A rock is thrown vertically from the edge of a cliff that is 500 ft ...

Physics - A boy kicks a rock off a cliff with a speed of 19.4 m/s at an angle of...

physics - REPOST PLEASE HELP a rock is thrown horizontally with a speed of 17 m/...

Physics - The rock reaches a maximum height of 20.4 m above the top of the cliff...