Please help projectile motion question

  • Thread starter runningirl
  • Start date
  • #1
118
0
please help!! projectile motion question

Homework Statement



You have a friend who is an archer and she wants to know how fast the arrows leave her bow. You have her launch an arrow horizontally, 1.5 m above the ground, and find that the arrow lands 33 m away. What is the initial velocity of the arrow as it leaves the bow?

Homework Equations



y=.5(-9.8)t^2

The Attempt at a Solution



i don't know where to start with this problem. i'm sorry :(
 

Answers and Replies

  • #2
222
0


This is a two stage problem. You first have to find the time it takes the arrow to reach the ground vertically. Then you can use that time to calculate the inital velocity of the arrow horizontally.
 
  • #3
16
0


Homework Statement



You have a friend who is an archer and she wants to know how fast the arrows leave her bow. You have her launch an arrow horizontally, 1.5 m above the ground, and find that the arrow lands 33 m away. What is the initial velocity of the arrow as it leaves the bow?

Homework Equations



y=.5(-9.8)t^2

The Attempt at a Solution



i don't know where to start with this problem. i'm sorry :(
Yf=Yo+Voy-.5gt^2
=1.5+0-4.9t^2
1.5/4.9=t^2
t=0.553 seconds
....
 

Related Threads on Please help projectile motion question

Replies
4
Views
1K
Replies
8
Views
1K
Replies
9
Views
1K
Replies
4
Views
3K
Replies
1
Views
3K
Replies
1
Views
2K
  • Last Post
Replies
8
Views
2K
  • Last Post
Replies
1
Views
7K
  • Last Post
Replies
9
Views
337
  • Last Post
Replies
2
Views
2K
Top