Answer:
The kinetic energy of a 4 kg mass moving at 3 m/s is 18 joules.
Step-by-step explanation:
The kinetic energy (KE) of an object is calculated using the following formula: (image inserted)
Where:
KE: is the kinetic energy
m: is the mass of the object
v: is the velocity of the object
In your case, the mass (m) is 4 kg, and the velocity (v) is 3 m/s. Plugging these values into the formula.
The unit of kinetic energy is the joule (J), which is equivalent to a kg m^2/s^2. So:
KE = 18 J