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 2 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
 2 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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

03225186213
 2 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
 2 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
 2 years ago
Best ResponseYou've already chosen the best response.1yaaa you are correct thnx @mathslover and @03225186213
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