A clay ball with a mass of 0.35 kg hits another 0.35 kg ball at rest and the two stick together. The first balls intial speed us 4.2m/s. What are the balls final speed?​

4.2 m/s

the balls final speed is V (m/s)

because the clay ball hits another and the two stick together

=> 0,35.4,2 + 0,35.4,2 = (0,35 + 0,35).V

<=> 2,94 = 0,7V

<=> V = 2,94/0,7 = 4,2