Question

0.5 kg ball at the peak of the kick 16.6 m above the field had a kinetic energy of 35.4 J. How fast was the ball booted by the player on the field?

Answer 1

total energy=mgh+1/2 ke at top

energy at booting= 1/2 m v^2
solve for v at kickoff, as energy at kickoff=total energy at top.