Arocketisgivenaconstantaccelerat ionof20ms2whatis

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Unformatted text preview: e 1 Chapter 2 Examples: 1. Starting fro m rest, an airliner achieves takeoff velo cit y of 100 m/s in 50 seconds. What is its accelerat ion? a= vf ­v (100­0)m/s 2 0 = =2 m/s t 50 s 2. A satellite’s velocit y is 15,000 m/s. After 30 seconds its velocit y reaches 30,000 m/s. What is the satellite’s accelerat ion? a= v f ­v (30000­15000)m/s 15000 m/s 2 0 = = = 500 m/s t 30 s 30 s 3. A car accelerates fro m rest and reaches a velocit y of 25 m/s in 4.8 s. What is the car’s accelerat ion? · For an accelerating object, velocity increases uniformly wit h time: vf = v0 + at vf = at (when initial velocity is zero) · For an accelerating object, distance increases non­uniformly wit h time: 1 d= at 2 2 9 Physical Science 1 Chapter 2 Examples: 1. A rocket is given a constant accelerat ion of 2.0 m/s2 . What is its velocit y 90 seconds after lifto ff? vf = at =(2.0 m/s2 )(90 s)=180 m/s 2. The driver of a car traveling at a velocit y of 30 m/s slams on the brakes and stops in 5.0 seconds. a) What is the car’s accelerat ion? a= v f ­v 0 (0 ­ 30)m/s = = t 5 s 6.0 m/s 2 b) How far does the car travel while braking? 1 1 d = at 2 = (6.0 m/s2 )(5.0 s)2 =75 m 2 2 3. A car accelerates fro m rest at a rate of 3.5 m/s2 for 4.0 seconds. a) What is the car’s velocit y after 4.0 seconds? b) What distance do...
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This document was uploaded on 03/18/2014 for the course CHEM 322 at Los Angeles Mission College.

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