Question

1.Suppose you kick a soccer ball with an initial speed of 12 m/s at a certain upward angle. After 4.0 seconds, the ball covers a 35-m horizontal displacement. What is the angle of inclination of your initial velocity? Use tan-1 in solving for the answer

Answer 1

$$x=v_xt=vt\cos{\theta}\\ \theta=\cos^{-1}{\frac{x}{vt}}\\ \theta=\cos^{-1}{\frac{35}{4\cdot12}}=43.18\degree$$