Posted by **Timothy** on Saturday, February 5, 2011 at 3:34am.

A boy throws a stone vertically up to a man standing at a heigt of 2 m above the boy. Of the stone is thrown up with a velocity of 7.0m s what is the velocity of the stone at the instant when it is caught by the man.

A clear explaination is greatly appreciated

- physical science -
**drwls**, Saturday, February 5, 2011 at 6:34am
Kinetic energy of M*g*H is lost, with H = 2.0 m.

The initial Velocity is

V1 = 7.0 m/s

The final kinetic energy is

(1/2) M V2^2 = (1/2) M V1^2 - M g H

Cancel out the M's and solve for the final velocity V2.

V2^2 - V1^2 = -2 g H

- physical -
**Timothy**, Saturday, February 5, 2011 at 11:33am
Does that give me a negative velocity?

## Answer This Question

## Related Questions

- physics - A boy drops a stone-A, down from a cliff 480 meters high, next he ...
- physics - From the edge of the rooftop of a building, a boy throws a stone at an...
- Physics - From the edge of the rooftop of a building, a boy throws a stone at an...
- physics - From the edge of the rooftop of a building, a boy throws a stone at an...
- Physics - From the edge of the rooftop of a building, a boy throws a stone at an...
- Math - A stone is thrown vertically upwards from a platform 60meters above the ...
- Dynamics - A stone is thrown vertically upward from the top of a 30m high ...
- Dynamics - A stone is thrown vertically upward from the top of a 30m high ...
- physics - A stone with mass m = 2.3 kg is thrown vertically upward into the air ...
- math - a child standing at the edge of a cliff 100m high throws a stone ...

More Related Questions