Lt. Col. John L. Stapp achieved a maximum speed of 632 mph in an experimental ro

Question

Lt. Col. John L. Stapp achieved a maximum speed of 632 mph in an experimental rocket sled. Running on rails and propelled by rockets, the sled reached its top speed within 5.0 seconds. Stapp survived the acceleration in slowing to rest during a time interval of 1 1/2 seconds.

a.) Find the average acceleration in reaching maximum speed

b.) Assuming the acceleration just calculated was constant, how far did the sled travel before attaining maximum speed?

c.) Find the average acceleration while stopping

Explanation / Answer

use the conversion factor 1mph = 0.4470 m/s

so 632 mph = 282.5 m/s

a. use avg accleration a = V/t

so aavg = 282.5/5

aavg = 56.5 m/s^2

-----------------------------------

b. use S = 0.5 at^2

S = 0.5 * 56.5 * 1.5 *1.5

S = 63.56 m

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Avg accleration while stopping aavg = (282.5 /6.5)

aag = 43.46 m/s^2

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