Question

why does a block of plastic released under water come up to the surface of water....

Answer this.. ​

Answer 1

Answer :-

This is because the density of plastic block is lower than the water and that's why it floats on water.

Answer 2

the density of plastic is less than that of the water so the force off buoyancy on plastic block will be greater than the weight of plastic block displaced . hence the acceleration of plastic block will be in upward direction and comes up to the surface of water.

I hope it helps you.