4. A current of 3.00 A flows through a resistor when it is connected to a 12.0 - V battery. What is the resistance of the resistor?*
2.4 ohms
36 ohms
4 ohms
0.3 ohms

Alead ball is dropped into a lake from a diving board 5m above the water . it hits the water with a certain velocity and then sink with constant velocity in bottom . it reaches the bottom 5 second after it is dropped if g= 10m/s2 . find depth of the lake and average velocity of the ball ?