Colonel John Stapp led the U. S. Air Force Aero Medical Laboratory’s research into the effects of high accelerations on the human body. On Stapp’s final run, he rode a rocket-propelled sled that reached a speed of 284.4 m/s (632 mph) and then stopped with the aid of water brakes in 1.2 seconds. Stapp was barely conscious and lost his vision for several days, but recovered. Determine his acceleration while stopping and the distance he travelled while stopping.

The us government wants to allocate billions of dollars in the next 10 years to assure our future energy security. the funds will be spread among a variety of possible energy resources. where do you think the government should put the greatest support: solar energy, wind energy, clean coal, oil exploration, gas exploration, or a combination of sources? are there other efforts that should be explored? support your position with cited information for both questions.

An object weighs 40n in air, weighs 20n when submerged in water and 30n when submerged in a liquid of unknown density. what is the density of the liquid?

In a system with only a single force acting upon a body, what is the relationship between the change in kinetic energy and the work done by the force? answers: work is equal to the change in kinetic energy. work depends on the square of the change in potential energy. work is equal to the negative of the change in kinetic energy. work is equal to the square of the change in kinetic energy