2.17- Acceleration Part A Dr. John Paul Stapp was U.S. Air Force officer who stu

Question

2.17- Acceleration Part A Dr. John Paul Stapp was U.S. Air Force officer who studied the effects of extreme deceleration on the human body. On December 10, 1954, Stapp rode a rocket sled, accelerating from rest to a top speed of 282 m/s (1015 km/h) in 5.00 s, and was brought jarringly back to rest in only 1.40 s! Calculate his acceleration and express it in multiples of g (9.80 m/s2) by taking its ratio to the acceleration of gravity. Acceleration Number of g's- Submit Answer Tries 0/10 Part B Calculate his deceleration and express it in multiples of g 9. Acceleration Number of g's Submit Answer Tries 0/10

Explanation / Answer

A)

while accelerating:

vi = 0 m/s

vf = 282 m/s

t = 5.00 s

use:

vf = vi + a*t

282 = 0 + a*5.00

a = 56.4 m/s^2

Number of g’s = a / g

= 56.4 / 9.80

= 5.76

Answer:

56.4 m/s^2

5.76

B)

while deccelerating:

vi = 282 m/s

vf = 0 m/s

t = 1.40 s

Use:

vf = vi + a*t

0 = 282 + a*1.40

a = -201 m/s^2

number of g’s = |a| / g

= 201 / 9.80

= 20.5

Answer:

-201 m/s^2

20.5

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