Struggling with Kinematics Homework?

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SUMMARY

This discussion focuses on solving kinematics problems involving constant acceleration. The key equations include acceleration formulas for horizontal motion, free fall, and initial velocity calculations. Specific problems addressed include a baseball thrown horizontally, a pile driver falling from a height, a meteor's initial velocity, and a car's distance covered during acceleration. Participants emphasize the importance of using standard constant acceleration equations to derive the correct answers.

PREREQUISITES
  • Understanding of kinematic equations for constant acceleration
  • Knowledge of basic physics concepts such as velocity, acceleration, and distance
  • Familiarity with units of measurement in physics (m/s, m/s²)
  • Ability to manipulate algebraic equations to solve for unknowns
NEXT STEPS
  • Study the kinematic equations for constant acceleration in detail
  • Practice problems involving free fall and gravitational acceleration (g = 9.81 m/s²)
  • Learn how to calculate initial velocity from final velocity and acceleration
  • Explore real-world applications of kinematics in sports and engineering
USEFUL FOR

Students struggling with physics concepts, particularly in kinematics; educators seeking to clarify these topics; anyone preparing for physics exams or looking to improve their problem-solving skills in motion analysis.

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HELP w/ Kinematics Problems??

Homework Statement


a) A baseball is thrown horizontally at 45m/s. The ball slows down at a rate of 5m/s^2. How long is the ball in the air before coming to rest?

b) A pile driver drops from a height of 35m before landing on a piling. What is the speed of the driver when it hit the piling?

c)A meteor falls from the sky to Earth. The meteor already had an initial velocity downward when it was spotted. If it hit the Earth at 335m/s after being seen for 30 seconds, then what was the initial velocity of the meteor?

d) A car started from a rest and accelerated at 9.54m/s^2 for 6.5 seconds. How much distance was covered by the car?


Homework Equations


a) a = change in velocity/time
b) speed = d/t
c) final velocity = initial velocity + (acceleration*time)
d) a & s


The Attempt at a Solution


a) a = 5m/s^2, v = 45m/s...now what??
b) speed = 35/t...NOW WHAT?
c) 335 = vi + (a*30)...now what?? is this even right?
d) (6.5)2 is 42.5s2...so is 42.5m the answer??


Physics completely baffles me. I'm not a math person at all. Any or all help would be GREATLY appreciated, thanks so much...
 
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Welcome to PF!

Hi dagitt! Welcome to PF! :wink:

For each question, use the standard constant acceleration equations (using g as the acceleration for questions b) and c) ) :smile:
 

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