**Answer:**

166.8 m

30.18 m/s

**Explanation:**

u = Velocidad inicial del automóvil = 120 km/h =

v = Velocidad final = 0

s = Desplazamiento

a = Aceleración

t = Tiempo tomado = 10 s

De las ecuaciones cinemáticas de movimiento tenemos

**La distancia que tarda el automóvil en detenerse es 166.8 m**

Ahora s = 30 m

**La velocidad a la que el otro automóvil sería golpeado es 30.18 m/s.**

All of them will have the same density

**Answer:**

<em>**The frequency changes by a factor of 0.27.**</em>

<em></em>

**Explanation: **

The frequency of an object with mass m attached to a spring is given as

=

where is the frequency

k is the spring constant of the spring

m is the mass of the substance on the spring.

If the mass of the system is increased by 14 means the new frequency becomes

=

simplifying, we have

=

=

if we divide this final frequency by the original frequency, we'll have

==> ÷

==> x

==> 1/3.742 = <em>**0.27**</em>