Car 1 drives 20mph to the south and car 2 drives 30mph to the north. from the frame of reference to car 1 what is the velocity of car 2?

To a Physics student riding in Car-1 and carrying

his frame of reference with him, he measures the

velocity of Car-2 to be 50 mph to the north.

real, smaller and upside-down.   so the answer should be b.

when heated, the valance electrons increased their speed and transferred the heat from electron to electron.   i just took the test.