Answer:
a = 0.44[m/s²]
Explanation:
Para solucionar este problema debemos de utilizar la siguiente ecuacion de la cinematica.
![v_{f}=v_{o}+a*t](https://tex.z-dn.net/?f=v_%7Bf%7D%3Dv_%7Bo%7D%2Ba%2At)
donde:
Vf = velocidad final = 50 [km/h]
Vo = velocidad inicial = 90 [km/h]
a = desaceleracion [m/s²]
t = tiempo = 25 [s]
Pero primero debemos convertir la velocidad de kilometros por hora a metros por segundo.
![90[\frac{km}{h} ]*[\frac{1h}{3600s} ]*[\frac{1000m}{km} ]=25[m/s]\\50[\frac{km}{h} ]*[\frac{1h}{3600s} ]*[\frac{1000m}{km} ]=13.88[m/s]](https://tex.z-dn.net/?f=90%5B%5Cfrac%7Bkm%7D%7Bh%7D%20%5D%2A%5B%5Cfrac%7B1h%7D%7B3600s%7D%20%5D%2A%5B%5Cfrac%7B1000m%7D%7Bkm%7D%20%5D%3D25%5Bm%2Fs%5D%5C%5C50%5B%5Cfrac%7Bkm%7D%7Bh%7D%20%5D%2A%5B%5Cfrac%7B1h%7D%7B3600s%7D%20%5D%2A%5B%5Cfrac%7B1000m%7D%7Bkm%7D%20%5D%3D13.88%5Bm%2Fs%5D)
Ahora podemos reemplazar en la ecuacion:
![13.88=25-a*25\\25-13.88 = 25*a\\25*a=11.11\\a=0.44[m/s^{2} ]](https://tex.z-dn.net/?f=13.88%3D25-a%2A25%5C%5C25-13.88%20%3D%2025%2Aa%5C%5C25%2Aa%3D11.11%5C%5Ca%3D0.44%5Bm%2Fs%5E%7B2%7D%20%5D)
Nota: El signo de la aceleracion se cambia a negativo, ya que el vehiculo disminuye la velocidad.
As you move down a column :
* the atomic number increases
* the number of protims increases
* the atomic mass increases
* the electronegativity decreases
Particles stay the same unless there is a chemical change whether the matter is solid, liquid or gas. ... When substances change state there is no change in mass so if 100 g of ice is melted 100g of water are formed this will boil to form 100g of steam (this is called "conservation of mass").
The answer is 570 J. The kinetic energy has the formula of 1/2mV². The total work in this process W= 1/2m(V2²-V1²) = 1/2 * 15.0 * (11.5²-7.50²) = 570 J.