The balls lying on the table were subjected to equal forces during the same period of time.

The balls lying on the table were subjected to equal forces during the same period of time. In this case, a ball with a mass of 3 kg acquired a speed of 15 cm / s. What speed has a 1kg ball gained?

The kinetic energy of the 1st ball is determined by the formula: E1 = m1 * v1 ^ / 2 where m1 and v1 are the mass and velocity, respectively. Then E1 = 3 * 0.15 ^ 2/2 = 0.0338 J.
Since the force is the same, the energies of both balls will also be equal: E1 = E2, then
m2 * v2 ^ 2/2 = E1
v2 = √2 * E1 / m = √2 * 0.0338 / 1 = 0.26 m / s = 26 cm / s