Used two wave in interference because
To create a path difference or To create a optical path difference

Aboxcar traveling at 12 m/s approaches a string of 5 identical boxcars sitting stationary on the track. the moving boxcar collides and links with the stationary cars and they all move off together along the track. what is the final speed of the cars immediately after the collision? (you may take the mass of each boxcar to be 18,537 kg.)

Find v(t), given acceleration a(t)=7j and initial velocity v(0)=k

What is the average speed of a car that travels 40mph for 1 hour and 60 mph in another hour will mark brainliest