7. A soccer player kicked the ball from a distance 30 m towards the goal. It just passed over the goal, 2.4 m above the ground. She kicked the ball

with an initial direction 40° above the horizontal. a) Write an expression for the time taken for the ball to cover the 30 m horizontal distance, in terms of the initial speed of the ball, u. b) Using the expression for time taken in a), use the given information about the vertical motion to calculate the initial speed of the ball, u.