Answer:

Explanation:
Let say the ball is projected at an angle with horizontal
So here two components of the velocity of the ball is given as


now the displacement in x direction is given as


in y direction it is given as


now from above two equations




Answer:0.4 m
Explanation:
Given
Maximum displacement A=0.49
The sum of kinetic and elastic potential energy is 
where k=spring constant
U+K.E.=
when K.E.=U/2
K.E.=kinetic energy
U=Elastic potential Energy

Explanation:
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The answer is
C. They have all ready achieved high levels of cardio respiratory fitness.