A ball is thrown upward from a platform 5.6 m high with a speed of 18 m/s at an angle of 35 o from the horizontal. What is the magnitude of its velocity when it hits the ground?
Use energy considerations:
Kineticinitial+ potentialinitial=kinetic energyfinal
1/2 m 18^2+mg*5.6=1/2 m vf^2
solve for vfinal