Two cars collide at an intersection. car a, with a mass of 1800kg , is going from west to east, while car b , of mass 1400kg , is going from north to south at 17m/s . as a result of this collision, the two cars become enmeshed and move as one afterwards. in your role as an expert witness, you inspect the scene and determine that, after the collision, the enmeshed cars moved at an angle of 65? south of east from the point of impact.

a) how fast were the enmeshed cars moving just after the collision?

b) how fast was car a going just before the collision?

A) Vf = 8.21 m/s

B) Va = 6.17 m/s

Explanation:

By conservation of the linear momentum on each axix:

x-axis:

ma*Va = (ma+mb)*Vf*cos(65°)

y-axis:

-mb*Vb = -(ma+mb)*Vf*sin(65°)

By dividing both equations:

Solving for Va:

Va = 6.17 m/s

Replacing this value into the x-axis equation:

Vf = 8.21 m/s

where’s the list ? the question is incomplete

speed of light in vacuum is 300,000 km/s

speed of light in other mediums is given by the expression v = c/n, where c is the speed of light in vacuum and n is the refractive index of medium.

for the first medium v = 200,000 km/s

  so, refractive index of medium = 300000/200000 = 1.5

    1.5 refractive index is usually for glass. so first medium is glass.

for the second medium v = 250,00 km/s

so, refractive index of medium = 300000/250000 = 1.2

    1.2 refractive index is usually for water. so second medium is water.

for the third medium v = 0 km/s

so, refractive index of medium = 300000/0 = ∞

    ∞ refractive index is usually for opaque mediums. so third medium is opaque medium.