Respuestas
Respuesta dada por:
2
1.- b) porque la desaceleración es aceleración pero negativa
2.- a)![m/ s^{2} m/ s^{2}](https://tex.z-dn.net/?f=m%2F+s%5E%7B2%7D+)
3.- vf=![5m/s+ 1m/ s^{2}(10s) 5m/s+ 1m/ s^{2}(10s)](https://tex.z-dn.net/?f=5m%2Fs%2B+1m%2F+s%5E%7B2%7D%2810s%29)
vf=![5m/s+10m/s 5m/s+10m/s](https://tex.z-dn.net/?f=5m%2Fs%2B10m%2Fs)
vf= 15m/s
R= c)
4.-![a= \frac{72km/h-36km/h}{30s} a= \frac{72km/h-36km/h}{30s}](https://tex.z-dn.net/?f=a%3D+%5Cfrac%7B72km%2Fh-36km%2Fh%7D%7B30s%7D+)
![a= \frac{36km/h}{30s} a= \frac{36km/h}{30s}](https://tex.z-dn.net/?f=a%3D+%5Cfrac%7B36km%2Fh%7D%7B30s%7D+)
∴
![a= \frac{10m/s}{30s} a= \frac{10m/s}{30s}](https://tex.z-dn.net/?f=a%3D++%5Cfrac%7B10m%2Fs%7D%7B30s%7D+)
![a= 0.333m/ s^{2} a= 0.333m/ s^{2}](https://tex.z-dn.net/?f=a%3D+0.333m%2F+s%5E%7B2%7D+)
R= a)
5.-![a= \frac{0-36km/h}{10s} a= \frac{0-36km/h}{10s}](https://tex.z-dn.net/?f=a%3D+%5Cfrac%7B0-36km%2Fh%7D%7B10s%7D+)
![a= \frac{-36km/h}{10s} a= \frac{-36km/h}{10s}](https://tex.z-dn.net/?f=a%3D+%5Cfrac%7B-36km%2Fh%7D%7B10s%7D+)
![-36km/h =-10m/s -36km/h =-10m/s](https://tex.z-dn.net/?f=-36km%2Fh+%3D-10m%2Fs)
![a= \frac{-10m/s}{10s} a= \frac{-10m/s}{10s}](https://tex.z-dn.net/?f=a%3D+%5Cfrac%7B-10m%2Fs%7D%7B10s%7D+)
![a= -1m/ s^{2} a= -1m/ s^{2}](https://tex.z-dn.net/?f=a%3D+-1m%2F+s%5E%7B2%7D+)
R= d)
6.-![d= ( \frac{72km/h + 144km/h}{2} )20s d= ( \frac{72km/h + 144km/h}{2} )20s](https://tex.z-dn.net/?f=d%3D+%28++%5Cfrac%7B72km%2Fh+%2B+144km%2Fh%7D%7B2%7D+%2920s)
![d=( \frac{216km/h}{2} )20s d=( \frac{216km/h}{2} )20s](https://tex.z-dn.net/?f=d%3D%28+%5Cfrac%7B216km%2Fh%7D%7B2%7D+%2920s)
![d=(108km/h)20s d=(108km/h)20s](https://tex.z-dn.net/?f=d%3D%28108km%2Fh%2920s)
108km/h= 30m/s
![d=(30m/s)20s d=(30m/s)20s](https://tex.z-dn.net/?f=d%3D%2830m%2Fs%2920s)
![d= 600m d= 600m](https://tex.z-dn.net/?f=d%3D+600m)
![R=b) R=b)](https://tex.z-dn.net/?f=R%3Db%29)
7.-![t= \sqrt{ \frac{2d}{a} } t= \sqrt{ \frac{2d}{a} }](https://tex.z-dn.net/?f=t%3D+%5Csqrt%7B+%5Cfrac%7B2d%7D%7Ba%7D+%7D+)
![t= \sqrt{ \frac{2(294m)}{0.12m/ s^{2} } } t= \sqrt{ \frac{2(294m)}{0.12m/ s^{2} } }](https://tex.z-dn.net/?f=t%3D+%5Csqrt%7B+%5Cfrac%7B2%28294m%29%7D%7B0.12m%2F+s%5E%7B2%7D+%7D+%7D+)
![t= \sqrt{4900 s^{2} } t= \sqrt{4900 s^{2} }](https://tex.z-dn.net/?f=t%3D+%5Csqrt%7B4900+s%5E%7B2%7D+%7D+)
![t=70s t=70s](https://tex.z-dn.net/?f=t%3D70s)
R= b)
8.-![vf=5m/s+6m/s^{2} (4s) vf=5m/s+6m/s^{2} (4s)](https://tex.z-dn.net/?f=vf%3D5m%2Fs%2B6m%2Fs%5E%7B2%7D+%284s%29)
![vf=5m/s+24m/s vf=5m/s+24m/s](https://tex.z-dn.net/?f=vf%3D5m%2Fs%2B24m%2Fs)
![vf=29m/s vf=29m/s](https://tex.z-dn.net/?f=vf%3D29m%2Fs)
R= c)
2.- a)
3.- vf=
vf=
vf= 15m/s
R= c)
4.-
R= a)
5.-
R= d)
6.-
108km/h= 30m/s
7.-
R= b)
8.-
R= c)
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