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A world's land speed record was set by Colonel John P. Stapp when, on March 19, 1954, he rode a rocket-propelled sled that moved down a track at 1020 km/h. He and the sled were brought to a stop in 1.4 s; see Fig. What acceleration did he experience? Express your answer in terms of g (= 9.8 m/s"), the acceleration due to gravity. (Note that his body acts as an accelerometer, not a speedometer.)

A world's land speed record was set by Colonel John P. Stapp when, on March 19, 1954, he rode a rocket-propelled sled that moved down a track at 1020 km/h. He and the sled were brought to a stop in 1.4 s; see Fig. What acceleration did he experience? Express your answer in terms of g (= 9.8 m/s"), the acceleration due to gravity. (Note that his body acts as an accelerometer, not a speedometer.)

Grade:upto college level

1 Answers

Navjyot Kalra
askIITians Faculty 654 Points
6 years ago
Given:

Initial speed of the sled, v0 = 1020 km/h.
Final speed of sled, v = 0 km/h.
Time taken to bring the sled to rest, t = 1.4 s.
Acceleration due to gravity, g = 9.8 m/s2.
Let us assume that the acceleration experienced by the sled and the colonel is a and can be defined as:


232-1255_8.PNG
Rounding off to two significant figures, we have
a = -21g
The negative sign shows that the acceleration on the sled and on the colonel is in a direction opposite to the direction of initial velocity.
Therefore the acceleration experienced by the colonel and the rocket sled is 21g.

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