Answer:
man will move in opposite direction with speed

Explanation:
As we know that man is lying on the friction-less surface
so here net force along the surface is zero
so if we take man + stone as a system then net change in momentum of this system will become zero
so here we have


here we have



Answer: 63 miles per hour
i think
Explanation:
I think it because of UV rays ultra violet ray which can make their colors different
No work is done because the object needs to be moved. The formula for work is Work = Force x Distance.