Thursday

October 30, 2014

October 30, 2014

Posted by **qwertzuiop** on Saturday, January 28, 2012 at 7:56pm.

And, for how much time was Marie's arrow in the air?

- physics -
**Damon**, Saturday, January 28, 2012 at 8:36pmv = Vi - 9.8 t

0 = Vi - 9.8 t

Vi = 9.8 t

99.5 = Vi t -4.9 t^2

99.5 = 9.8 t^2 - 4.9 t^2 = 4.9 t^2

t = 4.5 seconds to top

so

Vi = 9.8 * 4.5 = 44.2 m/s

You could also do this by conservation of energy

(1/2) m Vi^2 = m g h

so

Vi = sqrt (2*9.8*99.5)

= 44.2 m/s

**Answer this Question**

**Related Questions**

physics - Marie shoots an arrow vertically upward at a sandhill crane. If the ...

physics - Marie shoots an arrow vertically upward at a sandhill crane (she ...

Physics (Mechanics) - Marie shoots an arrow vertically upward at a sandhill ...

physics - An arrow is short vertically upward with an initial speed of 25m/s. ...

physics - An arrow is shot verticaaly upward. Two seconds later, it is at a ...

physics - An arrow is shot from the top of a building (height of 30 meters). The...

Physics - An arrow is shot from the top of a building (height of 30 meters). The...

Physics 11 - Mark Ji shoots a 40gram arrow straight up in the air at 30m/s ...

physics - An archer shoots an arrow horizontally with an initial velocity of 100...

physics! - A girl shoots an arrow from the top of a cliff. The arrow is ...