7) The maximum horizontal distance a boy can throw a ball is 50.0 m. Assume he can throw with the same initial speed at all angles. How high does he throw the ball when he throws it straight upward?

Given: v is constant at any value and x=50 m, then find the maximum hieght which is . We can also see that the motion of horizontal direction is given by , and also, since it's , also . So now just put this in the equation you will get ymax being 12.6 along with using the equation .

Hope this helps, now you know the answer and how to do it. HAVE A BLESSED AND WONDERFUL DAY! As well as a great rest of Black History Month! :-)  

- Cutiepatutie ☺❀❤

work: w = fd (given)

work done by chet   =50*1 = 50 j

work done by mika =40*2 = 80 j

work done by sara =30*1.5 = 45 j

work done by bill =60*0.5 = 30 j

students in order from the greatest amount of work done to the least is mika> chet> sara> bill

hence option (b) is correct.