Sunday

September 21, 2014

September 21, 2014

Posted by **Kristen** on Sunday, September 9, 2007 at 9:44pm.

- physics -
**bobpursley**, Sunday, September 9, 2007 at 10:20pmVf^2=Vi^2+ 2gd where g=-9.8 and d=-75

How long?

Vf=Vi+at solve for t (remember Vf will be negative)

- physics -
**drwls**, Sunday, September 9, 2007 at 10:38pmThe height of the package vs. time is

y = 75 + 13 t - 4.9 t^2

Set y=0 and solve for t. Use the quadratic equation and take the solution for which t>0.

For the speed when it hits the ground, use the time t from the first step and

V = 13 - 9.8 t

**Answer this Question**

**Related Questions**

physics - A hot-air balloon is ascending at the rate of 11 m/s and is 51 m above...

Physics - A hot-air balloon is ascending at the rate of 13 m/s and is 62 m above...

physics - A hot-air balloon is ascending at the rate of 13 m/s and is 73 m above...

AP Physics - A hot air balloon is ascending at the rate of 13 m/s and is 75 m ...

physics - 1.A hot air balloon is rising upwards at a constant velocity of 5m.s ...

Physics - A hot air balloon is traveling vertically upward at a constant speed ...

physics - A hot air balloon is going up ward at a constant speed of 3.5 m/s. ...

physics - A hot air balloon is traveling vertically upward at a constant speed ...

physics - A hot air balloon is traveling vertically upward at a constant speed ...

physics - A hot air ballon is ascending at 12m/s and at 80 m above the ground, a...