Find the kinetic energy of a 10kg body thrown horizontally at a speed of 20m / s, 3 seconds after the throw.

Kinetic energy W = (m * V ^ 2) / 2, where m is body mass, V is speed. Since the throw was performed horizontally, the total speed will have a vertical component and will be calculated using the following formula: V = √ ((g * t) ^ 2 + V ^ 2), where g is the acceleration of gravity = 9.8 m / s ^ 2
V = √ ((9.8 * 3) ^ 2 + 20 ^ 2) = 35.6 m / s. Substitute in the formula for calculating the kinetic energy.
W = (10 kg * 35.6 m / s) / 2 = 6336.8 J.
The response kinetic energy is 6336.8 Joules