Grass dear wolf is the right awnser
Answer: A 120 metros por segundo
Explanation: multiplicas la velocidad por el tiempo
B.adding carpet and fabric wall covering to absorb sound
Answer:
Velocity of proton will be equal to 4500 m/sec
Explanation:
We have given that proton moves right angles through a magnetic field
So angle between magnetic field and velocity of proton is 
Magnetic field B = 0.025 Tesla
Charge on proton 
Magnetic force on the proton is given 
Magnetic force on a moving charge particle is equal to 
So 
v = 4500 m/sec
So velocity of proton will be equal to 4500 m/sec