The muzzle velocity of a water bomb is 70, which is equivalent to 24 joules. The joule is the international unit of energy and work. In classical mechanics, 1 joule of energy is equal to the work done by moving the point of application of a force of 1 Newton by 1 meter in the direction of the force. According to the kinetic energy formula: Ek=1/2mv^2, v=(2EK/m)^1/2, the kinetic energy of the initial speed of 70 can be calculated according to this formula. is 24 joules. The muzzle velocity of the BB gun exceeds 70 m per second, the toy probably meets the gun certification standards. The kinetic energy of 24 joules is too high and there are safety concerns.
The 30 seconds of water bombs corresponds to a rate of fire of 30 per second.
Rate of fire refers to the number of bullets fired by a ranged weapon in a unit of time (usually one minute). It is divided into combat rate of fire and ctheoretical rate of fire. The unit is RPM.
Theoretical rate of fire is only the theoretical number of bullets fired by the weapon per minute, which is in a completely ideal state, not real.