• Support PF! Buy your school textbooks, materials and every day products via PF Here!

Downward, find airtime, velocity

  • Thread starter bigman8424
  • Start date
25
0
water ballon thrown down at 15m/s to ground 25 m below, what is air time and velocity at impact
y = y(i) + v(i)sint + 1/2gt2
y = 25 + 15sin(90)t + 1/2(-9.8)t2 ? ?
 
74
0
dude, try to understand the physics before pluging in numbers into a meaningless equation...read the book first...
 

HallsofIvy

Science Advisor
Homework Helper
41,711
876
1. What does "air time" MEAN?
2. More specifically, what ends the "air time"?
3. What is y when the "air time" ends?
4. No, not "y = y(i) + v(i)sint + 1/2gt2 "
5. Do you know what sin(90) is?

6. You need to solve an equation to find the time t when "air time" ends.
 
111
0
first of all, g is not -9.8. you throw it downwards, not upwards
 

Related Threads for: Downward, find airtime, velocity

Replies
3
Views
6K
Replies
4
Views
864
  • Posted
Replies
4
Views
4K
  • Posted
Replies
9
Views
165

Physics Forums Values

We Value Quality
• Topics based on mainstream science
• Proper English grammar and spelling
We Value Civility
• Positive and compassionate attitudes
• Patience while debating
We Value Productivity
• Disciplined to remain on-topic
• Recognition of own weaknesses
• Solo and co-op problem solving
Top