A community for students.
Here's the question you clicked on:
 0 viewing
mayankdevnani
 4 years ago
A body of mass 2 kg is thrown up vertically with a kinetic energy of 490 J.If the acceleration due to gravity is 9.8 m/s^2, the height at which the kinetic energy of the body becomes half of the original value is 
a) 50 m
b) 25 m
c) 12.5 m
d) 10 m
mayankdevnani
 4 years ago
A body of mass 2 kg is thrown up vertically with a kinetic energy of 490 J.If the acceleration due to gravity is 9.8 m/s^2, the height at which the kinetic energy of the body becomes half of the original value is  a) 50 m b) 25 m c) 12.5 m d) 10 m

This Question is Closed

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.1@Hero @hartnn @Chlorophyll @robtobey @sauravshakya @kropot72 @jiteshmeghwal9 @hba

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.1@mathslover have a look:)

mathslover
 4 years ago
Best ResponseYou've already chosen the best response.2First find the original value ... what you get?

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.1original value????

mathslover
 4 years ago
Best ResponseYou've already chosen the best response.2sorry i think it is given

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.0Potential energy of the body =mgh

mathslover
 4 years ago
Best ResponseYou've already chosen the best response.2490 J = KE (ORIGINAL)

mathslover
 4 years ago
Best ResponseYou've already chosen the best response.2half of it will be 490 /2 J = 245 J , correct?

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.1why you do the half the K.E @mathslover

mathslover
 4 years ago
Best ResponseYou've already chosen the best response.2@mayankdevnani because we have to find the height when the new kinetic energy equals half of the original one. ...

mathslover
 4 years ago
Best ResponseYou've already chosen the best response.2therefore the new kinetic energy must be equal to 245 Joules.

mathslover
 4 years ago
Best ResponseYou've already chosen the best response.2therefore we have : 1/2 m v^2 = 245 J 1/2 m (u^2 + 2gh ) = 245 J 1/2 m (2gh) = 245 mgh = 245 J 2 kg * 9.8 * h = 245

mathslover
 4 years ago
Best ResponseYou've already chosen the best response.2solve for h and you will get h = 12.5 m

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.11/2 m (u^2 + 2gh ) = 245 J ??????????????

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.11/2 m (u^2 + 2gh ) = 245 J this line!!!

mathslover
 4 years ago
Best ResponseYou've already chosen the best response.2since v^2 = u^2 + 2gh therefore..

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.1thnx.... i got it @mathslover

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.1let @03225186213 be answer.... plz wait

anonymous
 4 years ago
Best ResponseYou've already chosen the best response.01/2 mv^2=mgh 490/2=2 (9.8)h h= 9.8 because it is moving against gravity

mathslover
 4 years ago
Best ResponseYou've already chosen the best response.2@03225186213 same I thought BUT it is given in the quest. that g = 9.8 m/s^2

mayankdevnani
 4 years ago
Best ResponseYou've already chosen the best response.1yaaa you are correct thnx @mathslover and @03225186213
Ask your own question
Sign UpFind more explanations on OpenStudy
Your question is ready. Sign up for free to start getting answers.
spraguer
(Moderator)
5
→ View Detailed Profile
is replying to Can someone tell me what button the professor is hitting...
23
 Teamwork 19 Teammate
 Problem Solving 19 Hero
 Engagement 19 Mad Hatter
 You have blocked this person.
 ✔ You're a fan Checking fan status...
Thanks for being so helpful in mathematics. If you are getting quality help, make sure you spread the word about OpenStudy.