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as a ballon rises up its KE and PE both increase does this violate the law of conservation of energy Exclamation

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actually its gravitational potential energy is decreased ON RISING UP

gravitational potential energy = -GmM/R

m is its mass
M is earth's mass here and R is distance from earth's centre.
G is universal gravitation constant.

this gravitational potential energy gets converted into kinetic energy
gravitational constant = 6.67300 × 10^-11 m³ kg^-1 s^-2
it may sound strange to you now but it will become more clear in 11th

negative potential energy indicate bound stage if u give this much energy to body then it will go to infinity(out of earth's grav. field/will leave earth).Such min velocity given to body is escape velpcity.

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thankxx

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that's gr8!!!!!!! cheers