Given, range of projectile, R=100m Let initial and final velocities be u and v and angle of projection be θ. As we know that, In case of projectile motion, the final velocity of body always less than that of initial velocity of projection (v<u) and kinetic energy (KE)=
1
2
mv2 where, m is mass and v is velocity. ∴ Kinetic energy will be again maximum, when is will be again on ground at 100m from point of projection.