A soccer ball is kicked from the ground with an initial speed of 21.3 m/s at an upward angle of `45^(@)`. A player 55 m away in the direction of the kick starts running to meet the ball at that instant. What must be his average speed if he is to meet the ball just before it hits the ground?

Explanation

To solve the problem, we will follow these steps:

### Step 1: Calculate the Range of the Soccer Ball
The range \( R \) of a projectile launched at an angle \( \theta \) with an initial speed \( u \) is given by the formula:
\[ R = \frac{u^2 \sin(2\theta)}{g} \]
Where:
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