A 200-g ball is launched from a height of 20.0 m above a lake. Its launch angle is 40o and it has an initial kinetic energy of 90.0 J.
(a) Use energy methods to determine its maximum height above the lake surface.
(b) Use projectile motion kinematics to repeat part (a).
(c) Use energy methods to determine its speed just before impact with the water.
(d) Repeat part (c) using projectile motion kinematics.