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

Acceleration Due to Gravity

  • Thread starter thegreatone09
  • Start date

thegreatone09

A ball is thrown up into the air and it passes a certain window 0.3s after being released. It passes the same window on its way back down 1.50s later. What was the intial velocity of the ball?
Any help will be appreciated.
 

WhiteKnight

Ask yourself what the total flight time of the ball was.
 
Here's a simple hint I can give: if resistance is ignored, then the upward motion is 'symmetrical' to the downward motion.
 
10
0
total time

If you haven't got it by now the total time is 0.3 +1.5 + 0.3 = 2.1 s. Since the velocity is zero at it's maximum height you can divide the time in half to find how long it takes the ball to fall from its maximum height to the ground. Then use that time to calculate distance and then final velocity.
 

Related Threads for: Acceleration Due to Gravity

  • Posted
Replies
5
Views
879
  • Posted
Replies
6
Views
4K
  • Posted
Replies
1
Views
689
  • Posted
Replies
2
Views
807
  • Posted
Replies
3
Views
1K
  • Posted
Replies
1
Views
1K
  • Posted
Replies
2
Views
1K
  • Posted
Replies
18
Views
909

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