A 2.0-kg mass moving at 5.0 m/s suddenly collides head-on with a 3.0-kg mass at rest. If the collision is perfectly inelastic, what is the speed of the masses just after the collision?

speed of masses after collision = 2m/s

Explanation:

Using the formula for inelastic collision;

m1u1 + m2u2 = (m1+m2) v

Where m1 is mass of body 1

m2 is mass of body 2

u1 is initial velocity of body 1

u2 is initial velocity of body 2

v is final velocity

m1 = 2kg, u1=5m/s, m2=3kg, u2=0 (body at rest) v=?

(2*5) + (3*0) = (2+3) v

10=5v

v = 10/5

v=2m/s