Section 4.4: Projectile Motion (Ignore air drag) Problems 19 & 20: Projectile Mo

Question

Section 4.4: Projectile Motion (Ignore air drag) Problems 19 & 20: Projectile Motion The figure below shows the trajectory of the soccer ball during a goal kick by Tim Howard, the US soccer goalie during a 2010 FIFA world cup game. Six different locations (A - E) of the baill during its motion are also shown in the diagram 19. Rank these six positions according the acceleration of the ball, from greatest to least acceleration. Place the letter of the position in the appropriate box. If more than one baseball has the same acceleration, put them in the same box. Greatest Least Explain: 20. Rank these six positions according the speed of the ball, from greatest to least speed. Place the letter of the position in the appropriate box. If more than one baseball has the same speed, put them in the same box. Greatest Least Explain:

Explanation / Answer

19) In the whole motion the acceleration is due to gravity only, which is acting downward and having value g only.

So in all the case, the acceleration is same. So the ranking is A=B=C=D=E

20) in first half part of motion, the velocity is upward and acceleration is downward, so the velocity is decreasing. But on second half part, the velocity and the acceleration both are downward, so the velocity is increasing.

So speed at A and E are greatest. Then there comes to B and D. And at C, speed is zero.

So the ranking is A=E>B=D>C.

Related Questions

Navigate

• Browse (All)
• Browse S
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.