Q.Two loudspeakers are placed side by side and driven by the same source at 500 Hz. A listener is positioned in front of the two speakers and on the line separating them, thus creating a constructive interference at the listener's ear. If one of the speakers is gradually pushed toward the listener, how far must it be moved to repeat the condition of constructive interference at the listener's ear?

Q. A car started frm rest and accelerated for 5.00s at 6.00m/s2.Then it stayed at a constant speed for 20 s. It next slowed down at 3.00m/s2 until it came to a stop? how far did it travel during the first 5 s?