Monday

December 22, 2014

December 22, 2014

Posted by **tina** on Sunday, January 31, 2010 at 7:44pm.

- Did this for Brittany below -
**Damon**, Sunday, January 31, 2010 at 7:53pmfirst get time to fall to ground

a = -9.8

v = -9.8 t

-15 = -4.9 t^2

t = sqrt (15/4.9) = 1.75 seconds

-------------------------------

Now how long did it take to reach 3.1 m down

3.1 = -4.9t^2

t = .795 seconds

---------------------------------

so the second rock spends 1.75 -.795 or .955 seconds in the air

-15 = Vo (.955) -4.9 (.955)^2

.955 Vo = 3.64-15

Vo = - 11.9

so 11.9 m/s downward (negative)

**Answer this Question**

**Related Questions**

college physics - While standing on a bridge 15.0 m above the ground, you drop a...

Physics - While standing on a bridge 45.0 m above ground, you drop a stone from ...

Physics - While standing on a bridge 45.0 m above ground, you drop a stone from ...

physics - While standing on a bridge 45.0 m above ground, you drop a stone from ...

physics - While standing on a bridge 30.0 m above the ground, you drop a stone ...

physics - While standing on a bridge 15.0 m above the ground, you drop a stone ...

physics - While standing on a bridge 15.0 m above the ground, you drop a stone ...

physics - While standing on a bridge 15.0 m above the ground, you drop a stone ...

Physics - While standing on a bridge 18.3 m above the ground, you drop a stone ...

Physics - While standing on a bridge 19.1 m above the ground, you drop a stone ...