Answer:
b
Explanation:
it melts yes but it's still water [same element] so there fore it's a physical change
In physics, work is defined as the total energy when an object is moved to a certain displacement by the application of external force. It is calculated by the expression W = Fd. For this case, the displacement is apparently zero, then there is no work in the system above.
Answer:

<h3>B. Speed at which it leaves the ground</h3>
conclusion as last step. then see what happens next
Answer:
The speed of of the balloon is about 6.32 m/s
Explanation:
Assuming all of the work done is transformed into the balloon's kinetic energy, we can use the formula for the kinetic energy to answer the question:

Speed is the absolute value of velocity, so the speed of the balloon is about 6.32 m/s