Assuming the child is traveling at the speed found in part (a), what is their apparent weight, wa in newtons, at the top of their path? (at the top, the child is upside-down. ).

here we know that ball will drop down by total distance 3.2 m

so here we know that

now using kinematics

now in the same time it will cover horizontal distance of 0.75 m

so speed of the ball will be

a.   mass number from atomic number

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