5. Projectile Motion

A diver runs off a platform and leaps with an initial speed of $5.0m/s$ at a $15°$ angle above the horizontal. Which of the following correctly describes the initial vertical component of her velocity?

Which of the following statements about projectile motion with a horizontal launch is not true?

A stunt driver wants to make his car jump over 8 cars parked side by side below a horizontal ramp (Fig. 3–46). With what minimum speed must he drive off the horizontal ramp? The vertical height of the ramp is 1.5 m above the car roofs and the horizontal distance he must clear is 22 m. 

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A football is kicked horizontally from the top of a cliff. Which of the following best describes the initial velocity components of the football immediately after it is kicked?

At serve, a tennis player aims to hit the ball horizontally. What minimum speed is required for the ball to clear the 0.90-m-high net about 15.0 m from the server if the ball is 'launched' from a height of 2.30 m? Where will the ball land if it just clears the net (and will it be 'good' in the sense that it lands within 7.0 m of the net)? How long will it be in the air? See Fig. 3–50.

A rifle is aimed horizontally at a target 50 m away. The bullet hits the target 2.0 cm below the aim point. (b) What was the bullet's speed as it left the barrel?

A hunter aims directly at a target (on the same level) 38.0 m away. If the arrow leaves the bow at a speed of 21.3 m/s, by how much will it miss the target? 

The cannon in FIGURE CP4.83 fires a projectile at launch angle θ with respect to the slope, which is at angle Φ. Find the launch angle that maximizes d. Hint: Choosing the proper coordinate system is essential. There are two options.

Which of the following statements about projectile motion with a horizontal launch is not true?

A daring 510 N swimmer dives off a cliff with a running horizontal leap, as shown in Fig. E3.10. What must her minimum speed be just as she leaves the top of the cliff so that she will miss the ledge at the bottom, which is 1.75 m wide and 9.00 m below the top of the cliff?

What happens to the vertical component of velocity as a projectile is launched horizontally and moves upward after launch?$v\_y$ (vertical component of velocity) as a projectile is launched horizontally and moves upward after launch?

Which of the following quantities are constant during projectile motion?