1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
Neko [114]
3 years ago
6

A ball player catches a ball 3.24 s after throwing it vertically upward.With what speed did he throw it?

Physics
1 answer:
Firdavs [7]3 years ago
8 0
Doesn't seem like we know much here, but we can answer it. Let's talk about what we know. We know it takes 3.24 s for the ball to go up and drop back down again. We know that gravity is the only force acting after the ball leaves the hand, so a = 9.8 m/s^2 (we'll say it's negative in our equations because down being negative is intuitive). We also know that it stops moving for a brief moment at the top of the arc, where v = 0 m/s. Because gravity is the only force, and it slows it down on the way up at the same rate it speeds it up on the way down and the distance covered in upward and downward motion is the same, we can confidently say that it will reach the top of its arc (where v = 0 and it turns around) in half the total time it is in the air, so it takes 1.62 s to reach the peak. Now we can use a kinematics equation, let's use vf = vi + a*t, where vf is final velocity and is 0, vi is initial velocity and is some unknown v we need to solve for, a is acceleration and is -9.8 m/s^2 and t is time and since this is just to the top of the arc, we'll use half the time so 1.62 s. We can solve for vi and plug stuff in like so: v = -a*t = -(-9.8m/s^2)*(1.62s) = 15.876 m/s.
You might be interested in
If you ran 15 km/h for 20 min, how much distance would you cover?
nikitadnepr [17]
Since we have 15 kilometers per hour, and we're looking for 20 minutes, let's set up proportions.
20/60 minutes = x/15
20/60 = 1/3, so let's leave that simplified.
1/3 = x/15
Look at the denominators, 3 to 15 is a factor of 5, so multiply the numerator by 5.
1 • 5 = 5, so you will cover 5 kilometers in 20 minutes.

I hope this helps!
4 0
3 years ago
Which of the following is closest to 2cm?
Sloan [31]
C because the the smallest thing then the other ones because it never said what kind of size of it
4 0
3 years ago
3. What is a manometer used to determine?​
Gemiola [76]

Answer:

It's used to indicate pressure

3 0
2 years ago
Read 2 more answers
Which part of a wind-powered system ultimately produces the electricity? A. nacelle B. blade C. turbine D. generator
djverab [1.8K]
<span>The correct answer is: (D) Generator

Explanation:
In wind-powered systems, the wind energy turns the blades around the rotor of a wind turbine. That rotor is connected to a generator that generates electricity. In other words, the kinectic energy of the wind is converted into electrical energy by using the generator in the wind-powered systems.</span>
5 0
3 years ago
Read 2 more answers
 How does ​energy change (transforms) as the mass is dropping?
olganol [36]

Answer:

Mass has total mechanical energy, which is the sum of kinetic and potential energy. as the mass is dropping, potential energy is converted into kinetic energy so mechanical energy is preserved If there is no friction. If there is friction, some of the mechanical energy is lost as heat energy so it changes.

Explanation:

4 0
3 years ago
Other questions:
  • Technician A states that accidents avoidance is an additional feature on some electronic stability control systems. Technician B
    7·1 answer
  • When iron is exposed to oxygen it rusts or oxidizes. Which of these represents the balanced equation for this chemical change?
    10·2 answers
  • How can you increase the gravitational potential energy between yourself and earth?
    15·1 answer
  • Which type of mechanical wave moves back and forth?
    10·2 answers
  • PLS I NEED HELP ASAP!!!
    10·1 answer
  • Which of the following physical laws or principles can best be used to analyze the collision between the object and the pendulum
    5·1 answer
  • a crane lifts a 75 kg mass at a height of 8m. calculate the gravitational potential energy gained by the mass (g= 10N)
    11·1 answer
  • What are the Properties of Transverse Waves and Longitudinal wave
    14·1 answer
  • To win the game, a place kicker must kick a football from 30m from the goal, and the ball must clear the crossbar which is 3.05
    9·1 answer
  • N
    11·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!