Kinematics Name: PHYS-2053 Questions 7 through 9 pertain to the following statem

Question

Kinematics Name: PHYS-2053 Questions 7 through 9 pertain to the following statement: A tennis ball is fired vertically upward at time: O0 see with an initial speed of 40 m/s in a vacuum How high does the ball rise? (ae) 10.2 m (be) 20.4 m (ae) 40.8 m (bd) 81.6 m (e) 327m 7. Approximately, how long does it take the tennis ball to reach its maximum height? (be) 0.50 see (ab) 2.04 see (ce) 4.08 see (bd) 6.08 see (de) 8.16 see 8. 3 see. (cd) 50.6 m/s, upward (be) 38.8 m/s, downward (bc) 29,4 m/s, upward 9. What is the velocity of the ball at time: (ce) 10.6 m/s, upward (ad) 38.8 m/s, upward

Explanation / Answer

v0 = 40 m/s

a = - 9.8 m/s^2

7. at maximum height, v = 0  

vf^2 - vi^2 = 2 ad  

0^2 - 40^2 = 2(-9.8)(H)

H = 81.6 m

8. vf = vi + a t

0 =40 - 9.8 t

t = 4.08 sec

9. v = 40 -(9.8 x 3)

v = 10.6 m/s upward  

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