Alight beam in air strikes the surface of water at an angle of 35° to the normal. when it enters the water it bends toward the normal, making an angle of 25.5° to it. the velocity of light in air is approximately 300,000 km/s. what is the approximate velocity of light in water? a. 77,000 km/s b. 225,000 km/s c. 278,000 km/s d. 341,000 km/s

1. explain how you calculate the net force in any direction on the box. 2. suppose an upward force of 15n is added to the box. what will be the net vertical force on the box? 3. what force could be applied to the box to make the net force in the horizontal direction zero? explain. 4. suppose a force of 25n to the right is added to the box. what will be the net force to the right?