The train A is traveling at a constant velocity of 120 km/hr. The car B is traveling at 90 km/hr. At the instant the driver of the car notices the train, the driver slows down at a rate of 3m/s2. Find the velocity and acceleration of the train relative to the car.

Ametal ring 4.20 cm in diameter is placed between the north and south poles of large magnets with the plane of its area perpendicular to the magnetic field. these magnets produce an initial uniform field of 1.12 t between them but are gradually pulled apart, causing this field to remain uniform but decrease steadily at 0.240 t/s . (a) what is the magnitude of the electric field induced in the ring? (b) in which direction (clockwise or counterclockwise) does the current flow as viewed by someone on the south pole of the magnet?