A ball of mass 7 kg is thrown straight up in the earth's gravitational field with an initial speed v0 = 16 m/s.
a) What is the initial kinetic energy of the ball?
b) How much work does the gravitational force do on the ball if it goes up to a height h = 1.9 m?
c) What is the speed of the ball at a height h = 1.9 m?