Answer:
9000 J
Explanation:
Potential energy at the top = 10,000 J
Final potential energy = 1000 J
use the conservation of mechanical energy
Potential energy at top + kinetic energy at top = potential energy at a point + kinetic energy at that point.
10000 + 0 = 1000 + kinetic energy
kinetic energy = 10000 - 1000
kinetic energy = 9000 J
Thus, the kinetic energy is 9000 J.
It will float because the density is less than 1
Answer:

Explanation:
Let say the ball is projected at an angle with horizontal
So here two components of the velocity of the ball is given as


now the displacement in x direction is given as


in y direction it is given as


now from above two equations



