The parking brake on a 1000 kgkg Cadillac has failed, and it is rolling slowly, at 5 mphmph , toward a group of small children. Seeing the situation, you realize you have just enough time to drive your 2000 kgkg Volkswagen head-on into the Cadillac and save the children. With what speed should you impact the Cadillac to bring it to a halt?

Volkswagen must have to move with speed 2.5 mph

Explanation:

As we know that two cars will collide and stick together

So here we can say that

just after collision of two cars they both comes to rest

so here we have

v = 0

Now we have

so Volkswagen must have to move with speed 2.5 mph

c)as speed changes, wavelength and frequency change.

everything changes!

a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.