1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Kinematics in two demensions

  1. Oct 7, 2004 #1
    I have several similair questions like this but i dont know where to start? Mabey iam using the wrong equation > d=vnaught(t)+1/2at^2

    one of the questions states that a tennis ball is struck such that it leaves the racket horizontally with a speed of 29.5m/s. The ball hits the court at a horizontal distance of 20.6m from the racket. What is the height of the tennis ball when it leave the racket.

    I know iam looking for the distace, do i find time and then solve the above equation and if so how do i go about solving for time? :confused:
  2. jcsd
  3. Oct 7, 2004 #2


    User Avatar
    Science Advisor
    Homework Helper
    Gold Member
    Dearly Missed

    OK, when in doubt about which equations to use in kinematics, go back to the basics!!
    And that is: NEWTON'S 2.LAW OF MOTION!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
    So, can you set up F=ma, both the horizontal equation of motion, AND the vertical equation of motion?
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook