Go Back   Physics Help Forum > High School and Pre-University Physics Help > Kinematics and Dynamics

Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

Like Tree2Likes
  • 1 Post By studiot
  • 1 Post By skeeter
Reply
 
LinkBack Thread Tools Display Modes
Old Apr 26th 2017, 02:04 PM   #1
Junior Member
 
Join Date: Apr 2017
Posts: 4
Kinematics problem

Andy leaves the science building at a speed of 1.6 m/s, heading for the Student Center 50 meters away. He spots Beth 12 meters ahead of him, also walking toward the Student Center but moving at a steady rate of 1.2 m/s. He immediately begins accelerating toward her at 0.20 m/s2. Where and when do they meet?

*I am just not sure what formula to even use for this. PLEASE help. This is a study guide question, not for an actual grade...but I NEED to know how to do it.
fmfree is offline   Reply With Quote
Old Apr 26th 2017, 03:30 PM   #2
Senior Member
 
Join Date: Apr 2015
Location: Somerset, England
Posts: 1,035
Start by drawing a diagram, breaking the journey into parts.

What do you think the axes will be?
fmfree likes this.
studiot is offline   Reply With Quote
Old Apr 26th 2017, 03:33 PM   #3
Junior Member
 
Join Date: Apr 2017
Posts: 4
I'm thinking that displacement and velocity will be the axes?
fmfree is offline   Reply With Quote
Old Apr 26th 2017, 03:40 PM   #4
Junior Member
 
Join Date: Apr 2017
Posts: 4
or maybe it should be displacement vs time on the axes

Last edited by fmfree; Apr 26th 2017 at 03:51 PM.
fmfree is offline   Reply With Quote
Old Apr 26th 2017, 03:56 PM   #5
Senior Member
 
skeeter's Avatar
 
Join Date: Aug 2008
Posts: 113
$x=x_0 + v_0 t + \dfrac{1}{2}at^2$

Let $t=0$ mark the time and $x=0$ his position when andy spots beth 12 m ahead ...

andy's position equation ...

$x=1.6t+0.1t^2$

beth's position equation ...

$x=12+1.2t$

what now?
fmfree likes this.
skeeter is offline   Reply With Quote
Old Apr 26th 2017, 04:10 PM   #6
Junior Member
 
Join Date: Apr 2017
Posts: 4
AHHHH.... so you set them equal to one another and solve for t!!!! Then use x = 12+ vt to solve for WHERE they meet???
fmfree is offline   Reply With Quote
Old Apr 27th 2017, 03:19 AM   #7
Senior Member
 
skeeter's Avatar
 
Join Date: Aug 2008
Posts: 113
Originally Posted by fmfree View Post
AHHHH.... so you set them equal to one another and solve for t!!!! Then use x = 12+ vt to solve for WHERE they meet???
bingo.
skeeter is offline   Reply With Quote
Reply

  Physics Help Forum > High School and Pre-University Physics Help > Kinematics and Dynamics

Tags
kinematics, problem



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Kinematics in 1D problem dokrbb Advanced Mechanics 4 Jan 20th 2014 07:56 PM
Kinematics problem Dude_5 Kinematics and Dynamics 2 Dec 30th 2010 04:25 PM
Kinematics Problem mrtaylo6 Kinematics and Dynamics 2 Jan 25th 2010 01:41 PM
Kinematics Problem lewishas2work Kinematics and Dynamics 4 Jan 24th 2010 10:34 AM
Kinematics problem mp3 Kinematics and Dynamics 1 Jan 23rd 2009 07:15 PM


Facebook Twitter Google+ RSS Feed