Answer:
80 Joules.
Step-by-step explanation:
The kinetic energy (KE) of an object is given by the equation:
KE = 1/2 * m * v^2
where m is the mass of the object and v is its velocity.
Given that the mass of the stone is 10kg and its velocity is 4m/s, we can calculate its kinetic energy as:
KE = 1/2 * 10kg * (4m/s)^2
= 1/2 * 10kg * 16m^2/s^2
= 80 Joules
Therefore, the kinetic energy of the stone is 80 Joules.