Block A of mass 2.0kg is released from rest at the top of a 3.6m long plane inclined at an angle of 30 degrees. After sliding down the ramp, block a hits block b while at rest and weighs 3.0kg. What is the spped of the velocity after the collision.

The correct choice is c

Ray 2 should cross through the focal point on the right side of the lens.

The correct option is this: the sound waves from the two trombones have slightly different frequencies.from the question given above, we are told that the loudness of the sounds were increasing and decreasing, this is because the frequencies of the two sounds are different. the means that the number of waves that pass a fixed point in a given amount of time differ for both sounds.