Question

4. A bullet with a mass of 0.020 kg collides inelastically with a wooden block of mass 2.4 kg,

initially at rest. After the collision, the bullet + block has a speed of 1.21 m/s. What was the initial
speed of the bullet?
Given:
Sketch the before and after collisions:

Answer 1

MaiVai+MbiVbi=Vf(Ma+Mb)
(0,020)Vai+(2,4)(0)=(1,21)(0,020+2,4)
0,020Vai=2,9282
Vai=146,41 m.s^2