Physics Help Forum take-off velocity during a vertical jump

 Kinematics and Dynamics Kinematics and Dynamics Physics Help Forum

 Jan 17th 2014, 09:35 AM #1 Junior Member   Join Date: Jan 2014 Posts: 5 take-off velocity during a vertical jump Hello i need help here is my question. i am 74 kg, and did a vertical jump with a displacement of 40.667 cm. <
 Jan 17th 2014, 10:43 AM #2 Physics Team     Join Date: Jun 2010 Location: Morristown, NJ USA Posts: 2,310 The energy of your initial velocity equals the potential energy gain at the pek of yuor jump. Thus: (1/2)mv^2 = mgh Solve for v: v = sqrt(2gh) Note that you mass doesn't matter.
Jan 17th 2014, 06:10 PM   #3
Junior Member

Join Date: Jan 2014
Posts: 5
 Originally Posted by ChipB The energy of your initial velocity equals the potential energy gain at the pek of yuor jump. Thus: (1/2)mv^2 = mgh Solve for v: v = sqrt(2gh) Note that you mass doesn't matter.
care to explain sqrt =)

Last edited by catknight; Jan 17th 2014 at 06:43 PM.

Jan 17th 2014, 06:44 PM   #4
Junior Member

Join Date: Jan 2014
Posts: 5
 Originally Posted by catknight care to explain sqrt =)
ho nvm i got it

 Jan 17th 2014, 10:16 PM #5 Junior Member   Join Date: Jan 2014 Posts: 5 can any help me check if i am right? v = sqrt ( 2 x 9.81N X 0.407M) v = 3.026 m/s
Jan 18th 2014, 06:13 AM   #6
Physics Team

Join Date: Jun 2010
Location: Morristown, NJ USA
Posts: 2,310
 Originally Posted by catknight v = sqrt ( 2 x 9.81N X 0.407M) v = 3.026 m/s
Check your calculator - I get 2.8 m/s. I think you might have used h = 0.467m instead of 0.407m.

Jan 18th 2014, 06:17 AM   #7
Junior Member

Join Date: Jan 2014
Posts: 5
 Originally Posted by ChipB Check your calculator - I get 2.8 m/s. I think you might have used h = 0.467m instead of 0.407m.
ho thanks for the info i think i key wrongly no my calulator

,
,

,

,

,

,

,

,

,

,

,

# how to find takeoff speed in physic

Click on a term to search for related topics.
 Thread Tools Display Modes Linear Mode

 Similar Physics Forum Discussions Thread Thread Starter Forum Replies Last Post abrogard Electricity and Magnetism 3 Jul 15th 2016 03:25 PM toranc3 Kinematics and Dynamics 2 Jan 29th 2013 08:51 PM boubba_25 Kinematics and Dynamics 2 Apr 1st 2011 06:02 PM sk8boardbob Kinematics and Dynamics 5 Mar 10th 2009 08:59 AM chino109 Kinematics and Dynamics 3 Jan 30th 2009 08:23 PM