Posted by **JJ** on Friday, September 16, 2011 at 2:26pm.

You lean over the edge of a building that is 106 meters above the ground and throw an object straight upwards. This object takes 3 seconds to reach its maximum vertical displacement above your hand and then falls to the ground. From the moment it leaves your hand, how long does the object take to travel to the ground in seconds?

- Physics -
**Henry**, Sunday, September 18, 2011 at 5:15pm
Vf = Vo + gt,

Vo = Vf - gt,

Vo = 0 - (-9.8)3 = 29.4m/s.

h = 106 + (Vf^2 - Vo^2) / 2g,

h=106 + (0 - (29.4)^2) / -19.6=150.1m

above ground.

d = Vo*t + 4.9t^2 = 150.1m,

0 + 4.9t^2 = 150.1,

t^2 = 30.63,

t(dn) = 5.53s,

T = t(up) + t(dn) = 3 + 5.53 = 8.53s in flight.

## Answer This Question

## Related Questions

- Physics - An object is launched at an angle of 24 degrees above the horizontal ...
- Physics - One object is thrown straight up at 54.9 m/s from the ground at the ...
- Physics - On the earth, you throw an object up in the air at some velocity, v, ...
- physics - An object of mass 26 kg is thrown straight upwards from the ground at ...
- PHYSICS - An object is thrown straight upwards from the ground at 28 m/s. Due to...
- Physics - A ball is thrown upwards, from a building. It's height(h), in meters ...
- 11 Physics - my teacher gave me this question for review and i don't know how to...
- Physics - A boy stands on the edge of a building 7 meters high and throws a rock...
- Algebra 2 - An object is dropped from a small plane. As the object falls, its ...
- math - You are playing volleyball. You hit the volleyball with an initial ...

More Related Questions