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For the first part of this question I got 12.12m/s

B. With the help of a friend the boy measures the height to which the ball returns and finds it to be 5.2 meters. How fast was the ball moving when it left the ground?
I wrote this down
mass of ball: 0.40kg
height if house: 7.5
gravity: 9.8m/s^2
v1: 12.12m/s

Help please

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