A leaping frog leaves the ground with a speed of 4 m/s heading straight upward. The frog's mass is 100 g (so its weight is 1 N). What is the maximum height reached by the frog through this leap? Look back at the formulas for gravitational potential energy and kinetic energy if you forgot them.
(Hint: When the frog reaches its maximum height, it has no kinetic energy, so all of the kinetic energy that it had originally should have become gravitational potential energy.)