A firecracker before been lit has potential energy in it. It is chemical potential energy which is due to the explosives in it.When it is lit, it gets converted into heat,light and kinetic energy.
I would go with salt in ocean water as when you heat it and the water begins to evaporate it will leave the salt behind
Also water in mud as the water would evaporate and leave the mud residue behind
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Answer:
The right solution is "24.39 per sec".
Explanation:
According to the question,
⇒ 

The time will be:
⇒ 



hence,
⇒ 
