Question

why hosepipe is difficult to be kept in hands while water flows through it.

Answer 1

Because water applies equal and opposite force on the hose when it flows out. Due to the force it is difficult to hold the hose

Answer 2

Newton 3 rd law is DAT very action has an equal and opposite reaction. So when we on the hose pipe it exerts force on water and water when coming out applies equal and opposite force on pipe and ultimately on our hands