Answer:
(1) P = 100 kg-m/s (2) M = 40 kg.
Step-by-step explanation:
We need to solve the missing variable :
1. P=?, M=20 kg, V=5 m/s
If M is mass, V is velocity, then momentum P is given by :
P = MV
P = 20 kg × 5 m/s
P = 100 kg-m/s
(2) P= 3000 kg(m/s), M=?, V=75 m/s

Hence, P = 100 kg-m/s and M = 40 kg.