You throw a 2 kilogram ball straight up with an energy of 50 Joules. How high does the ball go?

First right from energy 50 J, equated to 1/2 m v2 the value of v initial velocity could be calculated. Now using s = v2/ g we can calculate required S.

Now with m=2, we get v2 = 50 and using g as 10 m/s2 approx

we get required s = 5m