badge image

Enroll For Free Now & Improve Your Performance.

User Icon
User Icon
User Icon
User Icon
User Icon

Thank you for registering.

One of our academic counsellors will contact you within 1 working day.

Please check your email for login details.

Use Coupon: CART20 and get 20% off on all online Study Material

Total Price: Rs.

There are no items in this cart.
Continue Shopping


A particle is projected that time its kinetic energy was KE1......and at the top point where vertical velocity is 0 its kinetic energy was KE2 ....... The ratio of KE2 : KE1 is 3:4 ........ find the difference in their velocities ...... Dear ankit let velocity at the begineeing ii u and angle of projection is θ. KE1 =1/2 mu 2 KE2 =1/2 m(ucosθ) 2 given KE2 : KE1 is 3:4 so cos 2 θ =3/4 θ =30 difference in their velocity =u-ucosθ =u-u√3/2 =u(1-√3/2) sir but answer of this is u/2 ....

10 years ago

Answers : (2)

chaitanya pansare
23 Points

then might be the ques. is asking the difference in vertical velocities which comes out to be usinθ-0 i.e. u/2-0=u/2

10 years ago
Badiuddin askIITians.ismu Expert
147 Points

Dear Ankit Shukla

last answer was on the basis of difference in velocity magnitude.

I think you want difference in velocity vector

Initial velocity =ucosΘ i + usinΘ j

final velocity =ucosΘ i


difference in velocity =ucosΘ i + usinΘ j -ucosΘ i

                             =usinΘ j

                            =u sin30 j

                            =u/2 j

magnitude            =|u/2 j|



Please feel free to post as many doubts on our discussion forum as you can.
 If you find any question Difficult to understand - post it here and we will get you the answer and detailed solution very quickly.
 We are all IITians and here to help you in your IIT JEE  & AIEEE preparation.

 All the best.
Askiitians Experts

10 years ago
Think You Can Provide A Better Answer ?
Answer & Earn Cool Goodies

Course Features

  • 728 Video Lectures
  • Revision Notes
  • Previous Year Papers
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Test paper with Video Solution

Course Features

  • 731 Video Lectures
  • Revision Notes
  • Test paper with Video Solution
  • Mind Map
  • Study Planner
  • NCERT Solutions
  • Discussion Forum
  • Previous Year Exam Questions

Ask Experts

Have any Question? Ask Experts

Post Question

Answer ‘n’ Earn
Attractive Gift
To Win!!! Click Here for details