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An athlete performs a Romanian deadlift with 197 kg bar from floor to hips (0.75 m) in 2.1 seconds.
1. How much mechanical work does the athlete perform? (Ignore the mass of athlete's body)
2. What acceleration does the athlete need to overcome to lift this weight?
3. How much mechanical power is generated from the athlete?
4. When the athlete has lifted the bar to the top of the lift, what is the potential energy of the bar?
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express the magnitude of the applied horizontal force.
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A ranger in a national park is driving at 28.0 mi/h when a deer jumps into the road 225 ft ahead of the vehicle. After a reaction time t, the ranger applies the brakes to produce an acceleration of a = -9.00 ft/s2. What is the most reaction time a..
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