ChiefKiasu:

reddiechan:

I think the balloon is possessed.

:rotflmao: Good one.

Does anyone even know what the question is? Did the question asked \"why the balloon move in different direction when air is released?\" or \"why the balloon move in opposite direction?\". If so, the question is obviously referring to Newton's 3rd Law, which I didn't know would be tested at the Primary school level. I'm not even sure how to use kinetic energy or gravitational energy to explain that strange movement.

It is why did the balloon travel in different directions.That was what i remembered

tan0117:

Today science paper have more life science or physical questions?

More of life science

Regarding the balloon question about why did the balloon continue to go up even though the balloon deflated, I have seen a similar question in a PSLE paper many years ago. The answer is most likely: The kinetic energy gained by the toy rocket has not been completely converted other forms of energy at point G. The kinetic energy gained by the toy rocket has been completely converted to other forms of energy at point L.Thus, the balloon only fall to the ground at point L.