The turret of a tank fires and 18.6 kg projectile horizontally at 1750 m/s. What is the recoil velocity of the 61,400 kg tank?

I seriously need help

Could someone . i have tried to solve myself but my calculation is off

You have a resistor and a capacitor of unknown values. first, you charge the capacitor and discharge it through the resistor. by monitoring the capacitor voltage on an oscilloscope, you see that the voltage decays to half its initial value in 2.70 miss . you then use the resistor and capacitor to make a low-pass filter. what is the crossover frequency fc?

What is the weight of a feather (mass = 0.0001 kg) that floats through earth's and the moon's atmospheres?