Projectile Problem - Time of Peak (1 Viewer)

Users Who Are Viewing This Thread (Users: 0, Guests: 1)

If a fireworks rocket has an initial upward speed of 58 m/s when launched, for how long will it coast before reaching its peak?

So could I use the equation t=v0z/g?

When I use this I get the peak to be 5.9s. Is v0z = 58 m/s or would that be 0? Am I approaching this correctly?
 
Anyone have an idea?
 
5
0
well you need an angle because time would depend on the angle you use. For example if you launched the rocket at a 50 degree angle the time to reach its peak would be 58sin50 / 9.81 = 4.42 secs. But if you launched the rocket at a 70 degree angle it would be 58sin70 / 9.81 = 5.55 seconds. So you would have to specify the angle.
 
oh ok, so even if you shoot the firework straight up, it still needs an angle?
 
5
0
well straight up it would be 90 degrees. 58sin 90 / 9.81 = 5.912 seconds.
 

Astronuc

Staff Emeritus
Science Advisor
18,176
1,563

The Physics Forums Way

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