Two lasers are shining on a double slit, with slit separation d. Laser 1 has a wavelength of d/20, whereas laser 2 has a wavelength of d/15. The lasers produce separate interference patterns on a screen a distance 5.30 m away from the slits. A. Which laser has its first maximum closer to the central maximum?
B. What is the distance Delta ymax - max between the first maxima (on the same side of the central maximum) of the two patterns?
C. What is the distance Delta ymax - max between the second maximum of laser 1 and the third minimum of laser 2, on the same side of the central maximum?

Aball is thrown from the top of a building with an initial velocity of 21.9 m/s straight upward, at an initial height of 51.6 m above the ground. the ball just misses the edge of the roof on its way down, as shown in the figure. (a) determine the time needed for the ball to reach its maximum height. (b) determine the maximum height. (c) determine the time needed for the ball to return to the height from which it was thrown, and the velocity of the ball at that instant. (d) determine the time needed for the ball to reach the ground. (e) determine the velocity and position of the ball at t = 5.35 s.