|

Mechanics

Cool goIITian

 Joined: 4 May 2011 Post: 48
10 Mar 2012 20:57:03 IST
4 People liked this
4
540
Kinematics
Engineering Entrance , Medical Entrance , NEET , JEE Main , AIIMS , JEE Main & Advanced , Physics , Mechanics , Kinematics , NewtonsLawsCirMotion , Work Power EnergyÂ collisions , Rotation , Gravitation , Simple Harmonic Motion , Fluid Mechanics , Materials Wave Sound , Super Position , units dimensions , com momentum , shm , wave sound

a bullet loses 1/20th of its speed on hitting a plank. what are the least number of planks required to stop the bullet?

Blazing goIITian

Joined: 2 Mar 2012
Posts: 308
10 Mar 2012 22:26:07 IST
0 people liked this

infinite..##

New kid on the Block

Joined: 3 Mar 2012
Posts: 17
10 Mar 2012 23:27:58 IST
5 people liked this

Ans is 11

v2 - u2 = 2as         eq No 1  ( V=19u/20)

02 - u2= N 2as         eq no 2

div eq 2 by eq1

we get N =10.25

rounding it to11

Cool goIITian

Joined: 4 May 2011
Posts: 48
11 Mar 2012 10:09:43 IST
0 people liked this

yes correct answer is 11. thnx for the method

Cool goIITian

Joined: 9 Jan 2012
Posts: 90
11 Mar 2012 14:12:22 IST
0 people liked this

ya

 Some HTML allowed. Keep your comments above the belt or risk having them deleted. Signup for a avatar to have your pictures show up by your comment If Members see a thread that violates the Posting Rules, bring it to the attention of the Moderator Team

## For Quick Info

Name

Mobile

E-mail

City

Class

Vertical Limit

Top Contributors
All Time This Month Last Week
1. Bipin Dubey
 Altitude - 16545 m Post - 7958
2. Himanshu
 Altitude - 10925 m Post - 3836
3. Hari Shankar
 Altitude - 10085 m Post - 2217
4. edison
 Altitude - 10825 m Post - 7804
5. Sagar Saxena
 Altitude - 8635 m Post - 8064
 Altitude - 6330 m Post - 1958

Physics

Topics

Mathematics

Chemistry

Biology

Institutes

Parents Corner

Board

Fun Zone