Calculating Velocity and Time of a Falling Object from a Given Height

  • Thread starter Thread starter openavalin
  • Start date Start date
  • Tags Tags
    Speed Time
Click For Summary
SUMMARY

The discussion focuses on calculating the final velocity and time of a rock thrown downward from a height of 52 meters with an initial velocity of 18 m/s. The correct final velocity when the rock hits the ground is approximately 31.45 m/s, and the time taken to reach the ground is about 1.402 seconds. The calculations involve using the equations of motion under constant acceleration due to gravity, specifically incorporating the initial velocity and the height of the fall.

PREREQUISITES
  • Understanding of kinematic equations
  • Knowledge of gravitational acceleration (9.81 m/s²)
  • Familiarity with initial velocity concepts
  • Basic algebra for solving equations
NEXT STEPS
  • Study the kinematic equations for uniformly accelerated motion
  • Learn how to derive final velocity using initial velocity and height
  • Explore real-world applications of projectile motion
  • Investigate the effects of air resistance on falling objects
USEFUL FOR

Students in physics, educators teaching mechanics, and anyone interested in understanding the principles of motion and gravity.

openavalin
Messages
1
Reaction score
0
Jen is standing on top of a 52 meter high building. She threw a rock straight downward at 18m/s.
How fast will the rock be traveling when it hits the ground?
Determine how long it will take for the ball to hit the ground?

my attempt: I got 31.45m/s as the speed of the rock and 1.402 seconds to hit the ground, but I don't think I did it right. Can someone please help me out?
 
Physics news on Phys.org
Show HOW you got what you got (and in future, use the homework template the way you agreed to do when you signed up for this forum).
 

Similar threads

Help with a confusing free-fall motion physics problem?
  • · Replies 1 ·
Replies
1
Views
2K
Find the Height of a Building by dropping a ball from the top
  • · Replies 7 ·
Replies
7
Views
3K
Question about Projectile Motion: Throwing a Flower Pot from a Balcony
  • · Replies 18 ·
Replies
18
Views
2K
Find the height of a lamp based on the velocities of projectiles
  • · Replies 40 ·
2
Replies
40
Views
3K
Oblique soccer shot calculation task
  • · Replies 38 ·
2
Replies
38
Views
4K
Solving Symbolically: Height of Cliff with No Air Resistance
  • · Replies 1 ·
Replies
1
Views
1K
Solving for Time to Reach Ground: Calculating Velocity of Sound over 50m
  • · Replies 2 ·
Replies
2
Views
2K
Rock off cliff - calculate height by using speed of sound
  • · Replies 2 ·
Replies
2
Views
6K
Calculating Height of Building w/ Sound Speed
  • · Replies 11 ·
Replies
11
Views
2K
Calculating Rock Speed on Impact from 10m
  • · Replies 12 ·
Replies
12
Views
2K