A 2.00-kg blob of putty moving at 3.00m/s slams into a 4.00-g blob of putty at rest. Calculate the speed of the two stuck-together blobs of putty immediately after colliding

Answer 1

momentum before = 2 * 3 + 4*0 = 6

momentum after = 6 kg * v

so
6 v = 6
v = 1 m/s

Answer 2

Above calculation off...need pay attention to weights:

A 2.00-KILOGRAM blob of putty moving at 3.00m/s slams into a 4.00-GRAM blob of putty at rest. Calculate the speed of the two stuck-together blobs of putty immediately after:

momentum before = 2 * 3 + 0.004*0 = 6.004

momentum after = 2.4 kg * v