The speed of the ball when the catcher catches it is 120 km/h.
The given parameters;
The velocity of an object projected upwards decreases as the object moves upwards and eventually becomes zero when the object reaches maximum height.
Also as the object starts to descend, the velocity increases gradually and eventually become maximum before the object hits the ground.
The final velocity of the object before it hits the ground will be equal to its initial velocity.
Thus, the speed of the ball when the catcher catches it is 120 km/h.
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