When oscillating, a ball of a mathematical pendulum weighing 100 g in the equilibrium position receives

When oscillating, a ball of a mathematical pendulum weighing 100 g in the equilibrium position receives a speed of 10 m / s. What is the vibration energy?

Everything is given to us in solving the problem.
But first you need to convert to the desired units of measurement:
M = 100 g = 0.1 kg.
Let’s write the formula for solving the problem:
Ek = m * v ^ 2/2;
Now we can supply values and count:
Eк = 0.1kg * (10m / s) ^ 2/2;
Let’s write down the answer:
Ek = 5J,
Do not forget that Ek- kinetic energy.
Answer: Ek = 5J