Please I need help with the following questions. Thank you.

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PHYS 2425 Student Worksheet Sound Waves Activity 1: 1-D Interference Problem Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. The frequency of the waves emitted by each speaker is 646 Hz. You are standing between the speakers, along the line connecting them and are at a point of constructive interference. How far must you walk toward speaker B to move to reach the first point of destructive interference? Take the speed of sound to be 344 m/s. Activity 2: Doppler Shift Problem A railroad train is traveling at a speed of 26.0 m/s in still air. The frequency of the note emitted by the locomotive whistle is 360 Hz. Use 344 m/s for the speed of sound in air. A. What is the frequency of the sound heard by a stationary listener in front of the locomotive? B. What is the frequency of the sound heard by a stationary listener behind the locomotive? C. What is the wavelength of the sound waves in front of the locomotive? D. What is the wavelength of the sound waves behind the locomotive?jos 1 . Post-Lab Questions Using the graph of force vs time on an object, find the impulse . Explain how you determined the answer 242 Force (N) 2. An object of mass 2.5 kg is moving in the negative x direction at a speed of 2.0 m/s. It experiences the impulse of Time ( 5 ) Figure A. What is the velocity of the object after it experiences this impulse? Show your work. 3. A ball of mass 1.5 kg is thrown upwards. It leaves the thrower's hand with an initial speed of 10 m/s. Take the upwards direction to be positive. a. After the ball leaves the throwers hand, how long does it take for the ball to return to the thrower's hand (initial height). b. What is the final velocity of the ball just before it reaches the thrower's hand? c. What is the change in the momentum of the ball? d. What is the impulse of the ball? e. What is the average force acting on the ball while it is in the air? What is the cause of this force? f. After the ball hits the thrower's hand, it comes to rest in a time of 0.25 s. a. What is the net impulse exerted on the ball by the hand? b. What is the average force exerted by the hand on the ball? (Don't forget about the gravitational force!)